374 SEC. 10. ELECTRICITY. 



1708. Dial Printing Telegraph. M. Guyot cVArlinccurt. 



Printing apparatus with electro-magnet of two planes and two effects ; one 

 of the planes at the open ends of the electro-magnet governs the receiver, the 

 other at the heel produces the impression of the letter. When the positive 

 and negative currents are thrown alternately and without interruption, the two 

 planes act together, and the local circuit of impression is open. On the inter- 

 ruption of any current, the plane at the heel acts alone, the two planes are no 

 longer united, and the printing takes place. 



1709. Morse Sounder. Dumoulin Froment. 



1709a. Morse's " Sender and Heceiver." 



Dumoulin Fromcnt, Paris. 



1709d. Photograph of Telegraph Punching Appa- 

 ratus. C. H. G. Olson, Christiania, Norway. 



17O9e. Photograph of Telegraphic Printing Appa- 

 ratus. C. H. G. Olsen, Christiania, Norway. 



17O9f. Photograph of Drawings of Telegraphic Ap- 

 paratus. C. H. G. Olsen, Christiania, Norway. 



1709g. MS. detailed Description of Automatic Print- 

 ing Apparatus. C. H. G. Olsen, Christiania, Norway. 



1709h. Drawing of Telegraphic Apparatus. 



C. II. G. Olscn, Christiania, Norway. 



17O9i. Two Copies of Pamphlet on Electric Tele- 

 graphy. Senor F. Riano. 



1708a. Automatic Printing Telegraph, constructed by 

 C. H. G. Olsen, Christiania, 



C. //. G. Olsen., Optician, Christiania. 



This apparatus consists of two principal parts. 



1 . The punching apparatus, on which the messages are prepared thus : 

 By depressing one of the keys of a keyboard in the apparatus, holes will be 

 punched in a paper ribbon, corresponding to letters and signs marked on the 

 keys. Then this ribbon is rolled up and applied in 



2. The printing apparatus, where it is run over a metallic roller. When- 

 ever a hole appears, a steel pin will make contact with the roller and 

 send a current to the line. The current will liberate the armature of a magnet, 

 by which a wheel with engraved signs and letters will revolve, and another 

 paper ribbon, applied under this wheel, is lifted into contact with it. If the 

 wheel has its right position to the writing on the perforated paper, the letter 

 desired will appear printed on the paper. (2 photographs, 7 drawings, and 

 a more detailed description follow.) 



1709c. Contact Breaker, with two discs, which can be 

 displaced, and sliding springs on glass inlets. 



Prof. Dr. Dove, Berlin. 



(See Transactions of the "Royal Academy of Sciences at Berlin, 1841, 

 p. 296.) 



