Patented Sept. 24, 1946 2,407,996 e STRQBOSCQPIC APPARATUS .EGR `PHONOGRAI’HS WilliamL. Nies, `WheatonJIl. :ApplicationFebl-.uary 7, 1945, SerialNo. 576,630 `4 Claims. , (CIL 88-`--14l- » 2 .1, This ‘invention relates `.to stroboscopic appa ratusior use inconnection withregulating .the speed „of rotation. of a Aphonograph record, land it has for its object the provision of a new andim proved arrangementcf `parts ywhereby the speedv > i of .the , phonograph .may ,readily be .adjusted so »as .to .cause .the reproduction `>to be `at -precisely .the ‘ same ._pitch asthat at which the recording` was effected.` .At times .a-.musicianfor amusic 4pupil desires `to 'playf asapart of‘anensemble` and uses for .this purpose a. phonograph, record of the selection, `and-_sometimes a specially . made record from which' the part to be added has been omitted in "the recording. In any‘such case, it is highly Aim portant ‘that ‘thereproduction `be effected at the illustrated inv ‘the accompanying drawing, in which i Fig; 1_ is a diagrammatic `Avertical sectional View through a phonograph >provided :with ¿the improved apparatus. Fig.- 2 is a »face View of> the structurel of‘Fig...1 as seen «from the right insaid figure; andl îFig.. 3 -is .a bottom'facefviewfof a portion'of the ring :by which fa :stroboscopicxscale is «attached Ato the bottom face of the turntable of the ¿phono graphpf Figa-1. i . ‘Referring ,now «"tofthev several `figures »ofiethe drawing, :in which ycorresponding partsîare indi catedlby @the = same »referenceicharactersg ll il -indi ißcates'lthe turntable ora Aphonograph of :any ap, prloved typey :drinenfbym¿vertical shaft 'i2 con 1Vsame speed as that‘at `wl‘lich‘the record was made, `nesteiîlc?ïhrougih'la :suitable `'gear “box yI 4 with» the which >is; ordinarily ‘at the` rate ' of ' approximately shafftrofua’variable-:speed.motor Hi.`-` .As shown, 78.26 revolutions per-minute. The-exact `rate at 'the "turntable: I0 iaisxrotatably Vmounted :above a which :recording is -effected ordinarily is that at 20 /large'opening flßì'in‘ :the‘top face cida-,housing 23 which a moving 92 step stroboscopic scale is made which serves to shield the bottom face of the to appear stationary when illuminated by a lamp turntable effectively from the room lighting. energized by 60 cycle alternating current. It is On its bottom face, the turntable I0 is pro accordingly the object of this invention to pro vided with an annular plate or ring 22 ñxedly vide an improved arrangement by which the re connected thereto, such ring 22 being provided production may be effected easily and conven on its bottom face in concentric position thereon iently at precisely this same speed. with a 9-2 step stroboscopic scale 24, comprising For effecting this result in the easiest and most 92 similar dots arranged in equally spaced rela satisfactory manner, at a minimum cost for ap tionship to each other about the ring. Below the paratus and operation, a 92 step stroboscopic 30 ring 22 at one side, an electric lamp 26 is pro scale has been employed so as to rotate in syn vided, such lamp being preferably a small neon chronism with the record and in such position glow lamp of a type adapted to be energized by as to be shielded from the room illumination, a 60 cycle alternating current for providing a small special source of intermittently flashing light amount of light sufñcient for illuminating the being employed for illuminating the scale and in scale on the ring 22. A mirror 28 is also provided volving 120 separate flashes per second. By plac in ‘position to reflect the image of a portion of the ing the stroboscopic scale on the bottom face of scale 24 outwardly through a window opening 30 the turntable by which the record is rotated and in the face of the housing 20 below the ring. protecting the scale from the room lighting, a With a record in position on the turntable, the comparatively small neon glow lamp can be ern motor l5 is energized for driving the turntable ployed to advantage energized by 60 cycle alter and the speed of the motor is adjusted for 'bring nating current, being adapted in the absence of ing the drive of the turntable and the record to . other lighting to provide sufñcient illumination precisely the desired speed, such result when` for enabling lthe operator readily and easily to effected being shown by the fact that under such observe the scale for determination as to whether circumstances the stroboscopic `scale 24 appears or not it appears to be moving. For- facilitating to be stationary. By reason of the exclusion of the observation of this scale, a mirror is pref erably employed for directing the reflection of a the room light from the face of the scale 24, a fairly small amount of light from the lamp 26 is adequate for enabling the operator easily to de portion of the scale outwardly through a window opening in the housing by which the scale is 50 termine when the adjustment of the motor is cor shielded. rect for holding the scale 24 apparently station It is one of the objects of the invention to im ary. The arrangement is such also that during prove apparatus of this type in sundry details the 4playing of the record the operator is able hereinafter pointed out. The preferred means by readily to observe any deviation'in the speed of which the several objects have been attained is 5 01 rotation of the record, as shown b-y an apparent 2,407,996 4 said Window, and an electric lamp mounted in said motor housing means in position to illumi nate said scale Without illuminating said mirror and adapted to be energized by alternating cur rotation of the scale as reflected through the window opening 30. In case the lamps 26 Were to be energized by an alternating current of a frequency other than rent of a frequency to cause the scale markings to appear to the eye to remain stationary when the scale is rotated at a predetermined selected the usual 60 cycles, the number of the markings in the stroboscopic scale employed should be in creased or cut down to correspond, as will be speed. readily understood by those skilled in the art. 3. A stroboscopic apparatus for use in connec While >theforrn of apparatus as shownis pre ferredfthe .invention’is not to be limited there 10> tion with regulating the »speed of .aïphonograpn comprising in combination a turntable having a to except so far as the claims may be so limited, it being understood that changes might wellloe , ',stroboscopic scale on its bottom face, variable speed mechanism for driving - said turntable, made in the form and arrangement ofthe parts _' housing means shielding ’said scale from the light without departing from the invention. of the room and having a window opening at one What is claimed is: ' ’side ashortdistance below said turntable, a neon ` l.- A stroboscopic apparatus for use in connec glow lamp adjacent to said Window opening in tion with regulating the speed of a phonograph, said housing means in position to illuminate said comprising in combination a turntable having a scale and adapted to be energized by alternating stroboscopic scale on its bottom face, housing, 1 current of a frequency to cause the scale mark 20 means shielding said scale from the light of the ings to appear to remain stationary when the room, and an electric lamp mounted within said scale is rotated at a predetermined selected speed, housing in position to illuminate said- scale to the Y and a mirror in position to reflect the light from exclusion of other light, a window in said hous said scale outwardly through said Window open ing, means reñecting the image of said scale for observation through said window, said lamp be» 25 4,. A stro‘boscopic apparatus for use in connec ing.- ing adapted to be energized by alternating cur to appear to the eyeA to remain stationary vwhen speed. ' ~ . 2. A stroboscopic apparatus for use inconnec K , tion with regulating, the speed of' a phonograph, rent of a frequency to cause the scale markings ~`the vscale is rotated at a predetermined selected ' comprising in combination a turntable having a 92 step stroboscopic scale on itsbottorn face, variable speed mechanism for driving said turn 430 tableyhousing means‘shielding said scale from tion' with regulating the speed of a phonograph, v‘comprising’ in combination a motor and a turn “tablehaving ‘a stroboscopic scale on itsy bottom the light of theroom> and havinga windowvopen ingV at oneV side a short distance below said turn table„a neon glow lamp adjacent to said window opening in said housing means in position to il face, motorv housing means shielding said scale` 35, Y luminate said scale and adapted to be energized ‘from the light of the room,'said'motor housing by60 cycle alternating current,l and amirror in "meanshaving an opening adjacent the bottom of said turntable and having a windowopening, a mirror mounted‘a short distance below said turn- ï' table to reilect the image of said scale through position to reflect the Vlight fromr‘said scale outwardly through said Window opening. WILLIANI L. NIES. '