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takes place a rotation of the key 29, which rotation is communicated through the cord - 31 to the cam shaft 33, and thus to the above described mechanism for closing the switch. 5 It is obvious that an endless web or apron might. be substituted for the revolving reel 19 and. that various other changes might be made in the al)or-e described device without (departiag from the spirit or sacrificing the 10 advantages thereof. I therefore reserve the right to make such changes and alterations- in said device as fairly come within the scope of the following claim:.. What I claim is: 15 In an advertising device, the combination with a rotatable receiver for a plurality of advertisements; of a motor, a shaft driven by said motor, a: cam on said shaft, a second shaft carrying means adapted to rotate the 20 receiver periodically from the first named -daft, a collar on said second named shaft,
said collar having a series of grooves there- in, a pawl pivoted adjacent to said. collar and having one end in engagement there- with, a lever pivotally mounted with one 25 end resting on said cam, a connection be- tween said pawl and lever, whereby when said cam is rotated, said pawl will be dis- engaged from the grooves to display a new advertisement, a phonograph arranged to be 30 operated by said motor adapted to an- niounce each advertisement as it is displayed and a mechanism by which the aforesaid motor may. be set in operation at any de- sired time. 35 In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. GEORGE A. STAFFORD. Witnesses: J. S. MURRAY, S. R. HICKMAN.
Stafford, George A.Advertising Exhibitor and Phonographic Annunciator,
patent,
July 25, 1911;
[Washington D.C.].
(https://texashistory.unt.edu/ark:/67531/metapth510075/m1/3/:
accessed April 18, 2024),
University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu;
crediting UNT Libraries Government Documents Department.