1,739,5 92 the stencil. for a suitable distance above the reflectiiiosurface 83, is n-iaintained in a flat coiidition by means of a pair of guides 89. The stencil may be i-iiacle of ceIlLiloid, cloth,' paper or aliy other convenient m,,iterial. 'rhe iiieclienisi-ii for caiising the operation of the rolls 86 and 87 is illustrated in Fig. 16. The sotirce of power is a suction iilotor 90 of- the rota,-y or piston type which is connected to the intake manifold 91 of an interiial coinbustion member 92 by iiieans of a sm,,Lll tube 9'o ir@ which is placed a v-,Llve 94 for coiitrolling the operation of the sio-n. A belt or chain 95 passes over the pulley 15 on the sucti-on motor shaft and drives a pulley or sprocket 96 which is secured to the shaft 97 that is mounted in a pair of pivoted arms 98 oiily one of -whicli is illustrated. These arn-is are pivotally mounted at 99 on 20 the frame worlc of the sion. Also mo-Linted on shaft 97 to, rotate therewith is a gear or frictioli roll 100 which froin the position shoavn iii Fig. 16 eno-,ages an idle gear or roll 101 and drives r@'ll 86 in a direction to wind the stencil strip on to this roll. 2,5 Mountecl below t . he rolls is a reversing arm 102 pivoted at 103 and upturned at each end to liglitly eng-,tge the surface of the stencil strip wo-Lind on the two rolls 86 and 87. 30 As shown in Fig. 16 tl-ie winding of the stei-icil strip from roll 87 to roll 86 has just commeiieed, and as tl@is goes on roll 86 increases in di,,Lmeter and roll 87 decreases in cliameter causing the reversing ,Lrm 102 to 35 @,lowly rotate about its pivot 103. This carries the upper end of an arm 104, which prcjects upwardly from reversing arm 102, past the center of pivot 99,-this takiiig place when all of the stencil strip has 40 been woup-d Lipon roll 86. When this occurs SI)iral sprino, 105 which is fixed to the upper end oi' trn-i 104 tt 106 and which is also attached at point 107 to a projection of arm 98 extencling below pivot 99, calises arm 98 to stiddenly swing about its pivot and sna 45 p tl-le sprocl,,et or gear 100 from engagement wit'ii idle gear 101 into enga-ement with an idle gear 108 at -the right. Gear 108 drives roll 87 through a seconcl idle gear 109, in the 50 clirection to cause the stencil strip to be reivound -Lipoii roll 87. When the stencil strip has been wound upon roll 87 tl-ie reversing mechanism again operates c,,tusing the strip to rewind Lipon roll 86. 55 This mechanism therefore causes the stencil strip with its various forms of advertising matter thereon to pass back and forth over the reflecting surf ace 83, so that a continuous series of advertisements or other displayed ($0 inatter is visible throuo,,h the window 85. The window 85 may be provided with a di:ffusing sheet of a crinkled and preferably colored diffusing material if desired, or such sheet may be placed either above or below the 65 stencil 88, the number of these arrangements beiii g the same as previously disclosed in connecti on with the other figlires of the drawings. It will be uiiderstood that if it is desired to do so the signs illustrated in Fio-s. 8, 9 and 10 inay be actuated by the spring motor inech- 70 aiiislii of Figs. 11 to 14, or by the suction motor mechanism of Figs. 15 aiid 16. To do this it is only necessary to coniiect the driving sh,,L ft of sliction motor 90 so as to rotate shaft 7.5 53 of Fig. 10, or to make a slinilar co,.iiiection betwee-n the spring motor mechanism and shaft 53. S imilarly the modified forms of si,-n illustrate d in Figs. 11 to 14, inclusive, may be 80 actu ated by the -wind wheel and Genev-,L gear mec hanism of Fig. 10 or by the suction motor of Fi-. 16. F urt-l-ierm6re, the signs shown in Figs. 15 ancl 16 may be actuated by the wind wheel ar- 85 raiig ed to drive tl-ie gear or sprocket 100, or this element may be driven by means of the sprin g motor of -LA'igs. 11 to 14, inclusive. What I claim as new and desire to secure by Letters P,,ttent of the United States is: 1. A daylight sign comprising a rotary 9 0 druin carrying a plurality of light receiving and reflecting systems CoDstructed to cause daylig ht to be visible within the drum in the forl-n of a plurality of desians and means for or) rotatin g said drum to bring said designs successiv ely intc, vie-W. 2. A daylioht sign comprising a rotary drum carryit-ig ,t pluralitv of light receiving and reflecting systems c;nstructed to cause 100 daylig ht to be visible within the drum in the form of a plurality of designs, and means for rotatin g 8aid drum in a step-by-step movement. 3. A chanoeable daylight sign comprising 105 a rotary dr -Lim havino, a plui@ality of chambers eacticontainili-g ,t daylight receiving and reflecting systen-i for causino- daylight to be visible within the cliiinber in tl-ie form of a design, and means for rotating said drum to 110 brino, said designs successivel@ into view. 4. cltyliolit sion comprising a rotary drum carryiD7g apl@irality of light. receiving and reflecting systems for causing daylight to be visible within the drums in the form of a 115 plurality of designs, mechanism includino, a Geneva gear f or rotating said drum and medns for driving said mechanism. In testimony whereof I affix my signature. LAWRENCE H. HYATT. 120 125 130

Patented Dec. 17, l@129 19739@592 UNITED STATES PATENT OFFICE LAWRENCE H. HYATT, OF NEW YORK, N. Y. SIGN Application filed September 8, 1928. Serial No. 304,720. This invention rel,,ttes fo signs and parti-etilarly to daylight sio-ns. Signs employip(r daylight as the sotirce of illumination have come iiito q@,iite general use through the ai-rqii.geiiie-,,it o-l" the parts of the sign in,such a iiiaii-@ier -,s Lo produce the illusion of bril1;- ai:i@ aitliicl,,,,! lightinol,. u These sig-ns consist essentially of ,L stencil, ,t reflect'lr,(,,,- suuj"ace and,,i difflising sheet such, @or e-lainple, as i, sheet of er;@nkled or ruffled glass. These parts are inoun@Led in a suitable or casing prefer,,tbly in sueb ial,,ti-iner tlia' all light is excluded froin the refl@ectilig sur-!-',ic,@, except the light employed to 15 i-ital@e the outline o.f the s@uencil visible. The lettei,s, el).aracters or ornimental desion of hi@ @he -,c-lvertiseii@ieiit or other matter -vv ch is to be clisp'layed, are placed in outline on the ii so tl-iat I 'Llie -lioht as 17iewed by the ,@,tene", !,.o GL-se@.ver is outliiied n the shape of these charac'uers. The criiikled or ruffled glass incre,.t,ges the aiiale with respect to the reflect'thii the characters are ino'suriace wi -i Nvhich visible aiid by dolol-in,- this sheet, or by in'@-ei@pos, -Lng a colored sheet of transparent at any stiltable point in the light reilecti.,i<@- syeteiii ol'tlie.S"Ign, the displayed matt-,.- i-iia@, 'i-,e iiade to stand otit viviclly in contrast'Lo its sui-ro,,indiiigs so that attention will be iiiore readily attracted to it ' is impor'carit that the reflecting surface be plane, tliat the s'L-eiicil be correctly assoclated-w,iththei-eflectingsurface,andalsothat 'usin(y sheet b used, and L t, ,t -,ood quality o' diff e 2,,i these coiiside@-ati(,ns 'Lo,-ether with the casing co,,- istru.-etion iiiereace the cost 6f such signs co,nsidert,,bly o7,,er the cost of an ordinary I)aiiited sil)-ii of tl-,e usual construction. For e.-.@al,.iple, iii orde,, to ob'L-aiii a suitable reflect40 ii-.g si-irfa-,e, it is desirable to use plate glass see-Lire ,t -Liniforiii ,tppearance of the characters displftyed, and it is also desirable to use a relal.,ively expensive grade of rtiffied .1, ass for the diT--usino- sheet in order to obei5 @Laiii proper dif@tislop- without the absorption of too much Hence it is desirable to 'oe ,tble to chan-e the ai-ratigement of the le'@l-ters )r clesio,ns displayed by the 'thol e sign, \,j-- -it the n cessity of i-ising E).n ei 50 tirel-\, iieiv sign. Acc ordingly one of the objects of the present invention is to provide a daylight sigia of the eharacter referred to ivhich is constriicte d in stich a.way that the arrangement of the letters, characters, or designs cal'i be 55 readil y rearranged, or changed altogether, so as to display a dlifferent advertiseinent. in the same si,-n. It is also desirable in a sign of this kiiicl to be able to perioclically change the adver- co tiseinent displayed to brino- out so-tile other advert ising feature, or for i%e purpose of attraetin g attention to the sig--ta, or in other ivords, causing people to tq@ke notice of it, aiid it is ,ilso an object of my invention to czi iiiipro%,e the construction of dayliohl- si(yns so as to cause a periodical change of the @advertise rnent or other matter displayed. -k further object of the invel'ition is to provide a changeable daylight sign, Nvith mech- lio artisin for changiii,- the displaye,-l matter wliieh is particularly adapted to be -,cttiated by a moving vehicle, -withotit incurring expense for ene.rgy to actuate the sio-n iiiechai-iisiii. A still further object of the inventio,.i i@ to so improve the constrtiction of cha-.igeable dayligl -it signs that the iieather ivill be ellided from such parts as it is desirable to protec t, aiid so that such signs may be coii- so struc'L ed at inoderate costs. i-n order to iiiake the principles of iny inventio n better understood, I have illustrall-ed severa l eiilbodiments of lily in-iprovecl sigii in the accompanying,dr,-Lwings, and the. in- s5 ventio n will be further described in coniiectioii therewith. In these drawino,sFi4o @. I is a perspective view of oiie form of iiiy i,.iiprovecl changeable daylight s@gn, Fig. 2 is a perspectii,e vic@v partly in see- go tion of a rotatable drum type of perio-lictlly chaiiei iig sign, Fig's . 3 to 6 inclusive are transverse seetions of slightly modified forilis of rotatable clruills , 95 Fig. 7 illustrates one method of moiinting the revolvable druilis shown iii Figs. 2 to 6 inclusi ve. Fio,. 8 is a vertical section of ,t hotising for the cfriims sl-,o",7i in Fi-)-s. 9- to 6 inclusii,e. flie '(-JO

1,739,502 druiu of Fig. 2, being illustrated in position in the housing, Fig. 9 is a vertictl section sin-iiiar to Fi-. 8 of a someivhat iiiodified form of 1,.ousing with a sliglitly different form of revolvable drun-i therein, Fig. 10 is a vertical secti6n taken iiear the end of the ho-Lisino,- shoni,n in Fio-s. 8 aiid 9 ilIListratin,o; mechanism for periodically rotatin(- the druiiis in a step b)T Step ent, "Ove'l' Figs. 11 to 14 inellisive si@oiv a iiuluber 6f i-nodifications of a soiiiewhat different forrn of changeable sign, in which the stencil is in disc foriii and rotated by a clock-,Aork mech15 eirlisnl, and Figs. 15 and 16 illusti-ate a still different iiiodificat-Lon in which tl-io stencil is of flexible mat6rial mountecl upon rollers which are drii,en by,a suction motor. 20 , Referring noav to the accoiiipanying drawings, and first to Fi-. 1, the sign here illustrated 6oiiiprises a frarnework 20 preferably of metal, in the top of @vhich is mounted a sheet 21 of a transpareiit i-naterial sucli as 25 clear (Ylass. At the rea-,! the fraiiie 20 drops verilic@lly for a short distance AAith a wall 22, and this ivall joins 9,n oblique wall 23 which terminates at the bottoin of the sign where it intersects the front of frame. 20. 30 The oblique wall 23 i@ proviclecl along its lower and upper inargiiis Nvith guides 24 underneath which is a reflcetinostirface 25 -which is col-nposed preferably a a sheet of plate glass metallized oni one surface to form @35 a mirror. Immediately overlyin- this sheet, and also retained in place by the @guides 24 there are a plurality of stencil elements 26. The term stencil is used herein to designate any device 40 which co-acts with the li-ht modifying systerii to cause the Eght to appear in the f-orl-n 6f a desired design or character. The stencil designs may take the form of letters, figilires, ornamental desi-ns or any matter Nvhlch it 45 ma@ be desirabl@ to display for advertisiiio, or or any other purpose for which a sign is used. The stencil elements 26 are preferably co,-nposed of thin sheets of opaqlie niaterial suel-i, .5o for example, as black celluloid, in which the characters or designs are cut. These stencils may be so cut as to cause the light eitl-ier Nvithin or without the boundai,y of the design or character to be reflectecl by the reflectin@ su@r.55 face. ThAt is, the arrangement may be suci-l that the desioms or chiracters @vill stand o-Lit in a black field, or vice versa. The stencil,, may also be made by direct codtilig 6f oi,-)aqi.ie material on the refl@ctino- surface 25, iii -",hich 60 case instead of EL sin(YI@ iiiirror being used, the reflecting surf aeg and steiicil elements would be coextensive. At the front of the sign there is moiii-ited in the fraine 20 a diffusing sheet 27 which is 66 composed 6f a translucent matei-lal ai-id pref - erably glass having a ruffled or crinkled s-Lirface. When, therefore, daylight entering at the top of the sign strikes the reflecting sur7 f ace 25, it is reflected in the outline of the stencil design against the difftising sheet. 27.. and the design becomes visible from poii,.ts 70 in front of the sign. The diflusinoshee@t. 27 is prefetably made of a lored or tinted glass, so that the stencil design Nvill stand out in a vivid color. I By iiieans 6T thi constructioii, the stencil @being placed in close proximity to the reflect@ ing surf ace, the design stands out in extremely sha;rp outll:ne. Moreover, tlie stencil clemenl-s 26 may be i@eadily i-enioved f rom the sigii 80 through either eni of frame 20 by slidinff Ullderneath the uuidos 24, and either re-arrapo-ed t5 zn or entirely iieplaced to change the wording of thesigiiorthecharactersdisplayed. Inaddition, the interior of the @sigil is protected because of tl-.e sheets 21 tnd 27, so that it is Oa impossible for the Nveather to come -Lii contact with aild injure the reflect-ino, surface 25. Referring now to Figs. 2 to 6 inclusive, the si,61@ns slioNNn in these figui@es are iiiacle in the 96 form of di-tims whicli, by placing in stil'-table rliountin can be revolved so ds 'Lo retidily and quiel@.ly el-iange the clisplay iiiat'Lei,. The frame,,Yorli: of. t.1-iese signs consists of a siiiiple longitudinal shaft 9,8, a plurali'by of longitlidinally extending meiiibers 29, one ol' these irlemb@rs beiiig placed at each corner of the drum, ancl rigidly joiiied too-etlier a-L each end of the druni as shown in Fio,. 7. Thesigri@drumssho-@vninFi,-@'s.2and3,,tre 100 C6nsttLicted so as to completel@y exclude water from the interior of the drum, and e,,tch of tl-ie signs@of Figs. 2 to 6 is arraneed to provide f or three con-iplete chaiiges 6f d'-I'splay mattei-. P,,eferring particularly to Fiy. 2, the coiii- 105 bined signs aiid refloceing slirfices are sh-o@vn at 30, 31 and 32. Eac.1-i of tl,-e six faces 33, however, is of clear, transp,,Lrent such as @elear glass, asid the di--tq'tisiiio, sheets, pi@eferably of c6lorect gl,,tss, are sho-":,ii Lt P)4, 10 35, and 36 ' In the modification of the sign shoivii iii Fig. 2, the dayll-uht -Dasses through diffusing sl-ieet 34 after enteridg through the clear sheet 33 above it, and is 'Lhen reflected by t,tie sten- 115 cilled reflecting surface 30. An obsei,ver in 'front of the sign sees the brightly illulailiated 6utline of the stencilled mirror tl-irough the front sheet 33 120 The driim of Fig. 3 differs froni the one shown in Fig. 2 iii that the diffusing @ll(,ets 37, 38 and 39, instead of being placed radially, a,,e ,rranged to take the place o'L certaiii of the cleat glass sheets 33. Thus every o'hei, 12@ outsicle sheet is a diffusina sheet preferably of crinli:led, colored glass, and the intern-lediate outside sheets are of clear glass and are desigdated 33'. Thc- stencilled reflectin(y stirf aces 30'. 31' 130

1,739,592 3 and .32' are in the same position as the similar parts in Fig. 2. Either of these drum signs, when in use is supported in 'uhe maniier shown in Figs. 7 ) or 8. In Fig. 7 shaft 28 is mounted to rotate in a pair of brackets 40 and 41 placed at the ends of the drum ancl provided with suitable feet for securing the sion in place on the top of the automobile, roof, or other poliit where 10 it is desired t6 locate the sign. Shaft 2S extends somewhat beyond bracket 40 and is provided with a hand-wheel 42 by which the sign may be rotated I)y hand. X star-wheel ,tnd ratchet mechanism, indicated generally by 15 nlimeral 43, is provided to maintain the sign in one of the tliree disp'Lay positions with one of the display faces 33 in an @pproximately vertical position. When the sign is located at an elevation above tl-ie eyes of the observ20 ers, the star-wheel mechanism 43 is arraiiged to hold the display faces 33 at a dowiilwardly inclinecl angle so as to mako -Lt e,,tsi r for t display m,,ttter in the sign to be visible. In this form o-'L the sio-n, the entire drum 25 is exposed to view, this not beino- objectionable bec,,tuse it is not intended tb,@tt the, drum of this modification be rotated to chanoe the display matter at very freq-Lient intervals. Eveli if the sign is changed often, howe-@er, 010 it is not objectionable to have the drum exposed, as it is neat ,ind attractive in appearaiiee. Furtherinore, the presence of glass slieets in each of the outside f aces of the drtim reduces the visibility on the inside of 36 tlie siun chambers wl-iieh are not ii@ use so that the display m,,ttter on the stencilled rplfleeting surfaces of these chambers cannot readily be seen. Referrii,ig now to Fig. 8, the drum of Fig. 40 2 is here shown iuounted in a holising coinprisin-o- an end plate 4-4: at each end of the drum, tlie t-v,,o eiid plates beina joined iit t) the front of the sign by an ap-ron 45 of metal or oti-ier suitable opaque material which 45 serves to coiieeal the drum and the operating i-iiechariism, whic@h is provided in this inst,,tnce for rotating the dr-Lim. The single face of the dr-um which it is desired to exhibit to view is visible, boviever, throlign aii 50 openi-.ig 46 in the apron 45. The operating mech,,t,,iism just referred to is illustrated in Fig. 10 and com rises Geneva gear elemeiits 47 and 48 mounted within ,t compartment 49 adjacent o-ne of the end plates 44. The gear element 47 is MO-Lii-itecl ri(-Yidlv on shaft 28, and gear elen-ient 48 rotates upon ,t shaft 50 arranged belo-@v- aiid parallel -with shift 28. A wormii,heel 51 also rotating on sh,,tft 50 is codnectco ed to di,ive o-ear element 48, and a vorm 52 drives ivorm--wheel 51. Worm 52 is carried by a shaft 53 -Li-Don the for-ward end of which a wind-wheel @4 is molinted. The form of sign is intended primarily G3 fcr use -upon motor vehicles. the current of air caused by the motioia of the vehicle p,,tst wind-wheel 54 being utilized to drive the oearin- just described and calise the inter@aittei@t or step by step rotation of the sign dri-im, tl-iereby periodically ch,@iiigiiig the 70 matter disl:)Iayed by the sign as the motor vehicle moves. Referring iiow to Figs. 4, 5, an-,I C) th-re are here illustrated th@ee sligl-itly ditTel@;-nol, modific,,ttions of the rotatable sign driijii. in 75 these forins of drui-ii there is no attei-iipt made to prevent the weather Alrom con-iin(y in conZD tact with .tll the parts of the drui-ii @is iii the forni s previously described' In Fig' 4, thre e stencilled n-iirrors 55, similar to thc@se so enipl oyed in the driims of Figs. 2 anci 3, are inou nted radially in a hub or spider constrlic tion on shaft 28, and in'L-eriiiecli-,ite ,incl eq. Lial,ly spliced beiween these three s4ueiicillecl mirr ors, are placed three diffus;-nlo,- sl)eets 56, 85 also radially moutited. The da37!ight entei-- ing froi-ii above passes +hrough the diffusili(- shee t tiid is reflected by the stencilled mirror, on the stirface of which tlle characters, lette rs or other matter displayed -is vis;-ble. go It is to be understoocl that the stencils o-L' the stencilled reflect;.iig surfaces 'Lhe dr-Lin-i sho wn in Figs. 2, 3 and 4 iiiay be of the chan geable constrtiction describeci in tion with Fig. 1, if desired. In this iy,,ty @-io@' t)5 only can a plurality of di-jterei-it sial,.s be display ed one ,ifter the other in rapid st,,ccession, but @'uhe disidlayed iiiatter in each of tll-.ese sign "n be changed from time to tiine, w,@ths c' out the necessity of rebuilding tl-ie sig,.i. 100 I n Figs. 5 ---nd 6 ' rotatable dr,,iris ,ille i-lluslu -rated whi.el-i are n-iade according to t'tie prin ciple of a daylio,ht si(yn which h,-zs heretofor e been used f or a stationary sigil. Ili this type of daylio-lit @-igi-i, 'ulie stencil, i.-i- 1 05 stea d of beina -Dlac@cl adjaceiit 'uo the reftect.- ing slirf ace, i@'s 'placed @@, dj acent the diiT-tisi-.ig shee t, and the observer views ip. a plane refleeti ng surface or mirror t'lie illiage of tlie, sten cilled design. iio I n Fig. 5, plaiie reflecting surf,,Lces or n-iirrors 57 are radially niouiited in the hub of shaft 28,, and the di ff Lising sheets preferably of crinkled colored glass 58 illounted ill parlllel relation to the reflecting surf aces 57 -witb ii5 whic h they co-,Let, being placed as three outside faces of the hexagonal drum. The stencils 59 tre mounted on the inside surfaces of diffu sing sheets 58. In Fig. 6, the rnirrors 57 are arr-,nged ir, i2o exac tl the s,,ime way as in Fig. 5, bi-it tlle y sten cilled di:ffusino@ sheets, inst-lad oi bein@, mou nted in parallel relation to their respective reflecting surf tices 57, are mo-Lintecl at an angl e thereto, being secured to the hub o-f i25 shaft 28.and spaced iiiterinediate tl-le respective reflecting surf aces 57 ' It is to be understood that the stencils of the drums of Fios t-l- 5 and 6 iiiay be made in sections aiicl removable in a similir maii'ner i,,@ 9

4 to the stencils of Fig. 1 if it is desired to do SO. It is also to be understood that in any of the drliiiis illustrated in Fi.gs. 2 to 6 inelusive, -wliere colored cliffusiiig sheets are employed, they inay be inade of different color in the saiiae sign, s,o that ,is the dru,@in revolves each of the siglis bi-ou-@ht into v@.e-w wi'il be displ,,tyed in a different color. Referring now to Fi.g. 9, the revolviiig drlim here consists simply of tliree stencilled 0 reflee iig surfaces 60 radiall@ inounted in.the hub o@ii a sha'Lt 28, the druni being interliaittent][y revolved by mechinism previously clei scribed in connection with F g 10. In this 1,3 case, hoivever a casing 61 completel surI rou.nds the rotatiiig drum so as to conceal it from view and protect it from the weather. In the casing thei,e is an uppei@ li(yht-adi-nittin,- opening 62 and a front openin(y 63, E.0 through which the displayed matter is vi@sible. A diffusing sl-ieet is placed in one or the other of these openiiigs, and a sheet of clear glass or other suitable transparent matei-l,,tl in the other openiiio,, th.at is, the diff@i-sing sheet iray be 1 lteed in opening 62, aiid a clear transpare@n.t sheet in oponing 63, or vice versa. In the foriner case the operation of th light I reflecting systen-i of the sign is similar to the lightreflecting system of the drum shown in 3o Fi(y 3, and in the latter case it i@ siinilar to the light reflecting system of the. drum slio@yn in Fig. 2. The@ difference is that ii-i Figs. 2 and 3 all of the n-ieinbers of the light receiviiig and'reflecting system rotate, whereas in the 35 coilstriletion of Fig. 9, only the stencilled refleeting surfaces rotate. The form of chan (yeable sign shown iii Figs. 11-14, inclusive, is intended f or use whc@re it is desirable to have the device more comA@o pact, and accordingly only a single chamber and single Jig ht receiving and reflectincy system is used, and the el-iange in the, display matter is e ff ected by moviirig the stencil rela,tive to tl-ie other parts of the light sy@tein.. 45 In the form sliown iii Figs. 11 and 12 a reflectiiig surface 64 is mounted at an angle appro.ximately 451 to the horizontal within the chan-iber 65 which is open at the top or covered with a protective sheet in clear glass 5o if desired. The lioht admitted to chamber 65. from Z, above is reflected by inirror 64 in the direetioii of stencil 66 which is mounted upon ft transpareiit disk 67 preferably of difftising i@-.iateri,@il such as inli:led or roughened glass, er and also preferably colored in some vivid hi-ie. The tr,,tnsp,,trent disk 67 carryiiig the stencil is secured iipon the otiter end of a rotating sliaft 68 which is driven by a spring CO motor iilechanisin indicatecl diagrammatically at 69, and housed within a casing 70. at the rear of the sigd. The disk 67 in rotating under the action of the spring motor brings a plurality of de(;3 sio-ns or characters cut in,the stencil 66 suecessively opposite a window 71 in the front of the s-ign cas . ing. The windo7 71 is @OPPOs,',te the reflecting surface 64 so that as each of the designs passes the windo-w it is brilliantly illuminated by daylight which is pro- TO je6ted thro-Ligli the,stencil by th,e refle,eting surface. The sprin(y inotor may be a@ranged to ro7, tate the stencil disk in a step-by-step moveiiient or in a continuous moveinent as de!15 sired. In Fig. 13 a similar spring motor mechanisin is housed within a:!compartment 72 and a ed to rot te a tr.ansp,,trent disk 73 arr ncy a which is mounted horizontally above th is 8 compartmeiit. This disk is prqvided with a stencil 74 similar iii all r.espects to stencil 66 and h.aving any desired desion ciit therein. The casino, of the sign covers the, u surface of disk 73 exced-t for a window at the i-ight of the sign, 'and when the stencil characters are moved op,posite this window the liglit passes through the s.tencil and the transparent disk 73 And strikes the reflectiiig u ae s rf e 76 so that an observer at the right go of the sign may look th rough the vertic,,tl w'ndow 77 and see in.the mi or '76 the r - I rr e flection of the stencil characters. , It will be understoo@cl that disk 73 is preierably of tl-ie same type as digk 67 in Fig. 12. 95 In the inodified f orna shown in Fig. 14 the stencil 78 is placed directly on'the surface of the reflectin(I surface 79 as in Figs. 1 to 4, iiielusive. The lialit eaters the open top of the light receivino, chamber 80, and is re- ioo flected by the mirror against the diff-Lising slieet 81, on which it is visible from the front of the sign. In this form of my itivention the reflecting surf,,tee or mirror 79 is in,the form of a cir- 10 cular disk which is either continuously -oi- in- 5 termittently revolved by means of a spring motor mechanism within the casing 82 so as to bring the plurality of designs of steiicil 78 successively into ihe chamber 8,0 wlicre 110 they are successively displayed. In the n-iodification of my invention illustrated in Figs. 15 and 16 the reflectidg s-Lirf ace is mounted in a stationary position at an angle of approximately 45' with the horizon- 1 tal Nvithin t,he light receivino- and reflectin 9 chamber 84 in the front of N@hich there is an OpeDing 85 which naay be provided with a sheet of clear glass if desired, ancl -through which tli e display matter of the sigi@ is visible. 120, From the upper part of chamber 84 are two rolls 86 and 87 upon which are wound a strip of transparent flexible stencil material 88 throughout the length of which letters, characters or other designs are placed-to form 125 a series of advertising or other display n-iaterial. Mechanisni to be presently described causes the continuous winding of this flexible stencil 88 from one of the rolls 86 and 87 to the other and'in passing between these rolls 130