Page:United States patent 707064.pdf/2
United States Patent Office.
Wireless Telegraphy.
Specification forming part of Letters Patent, No. 707,500, dated August 12, 1902.
Application filed June 1, 1901. Serial No. 62,717. (No model.)To all whom it may concern:
Be it known that I, Harry Shoemaker, a citizen of the United States, residing at Philadelphia and 5State of Pennsylvania, have invented certain new and useful Improvements in Wireless Telegraphy, of which the following is a specification.
This invention relates to improvements in 10wireless telegraphy; and the main object of my invention is the provision of an apparatus especially adapted for outdoor and long distance work and one which will absolutely prevent the feathering or the adhering to the 15silver plugs of the filings in the coherers and an apparatus which will produce a dot and a dash.
Another object of my invention is the provision of a receiving apparatus having a 20series of coherers in the main circuit, one decohering means operated to decohere one of the coherers as soon as the coherers lose their resistance and the other decoherer operated as soon as the first-mentioned coherer again 25conducts.
To attain the desired objects, my invention consists of a wireless-telegraph system embodying novel features of construction and arrangement of parts, substantially as 30disclosed herein.
In the drawing I have illustrated a diagrammatical view of an entire system of wireless telegraphy embodying my invention.
Referring to the drawing, A designates the 35air-plate, connected by the wire 1 to the wire 2, this wire being connected to the wire 3, coherer 4, wire 5, wire 6, wire 7, coherer 8, wire 9, wire 10, and a condenser 11, this constituting a portion of the main circuit and 40completing it with the ground G by means of a wire 12. The main circuit, however, is not directly through these wires, but through wire 13, batteries 14, wire 15, relay 16, wire 17, wire 18, electromagnet 19, and wire 20, which is 45connected to wire 3. A resistance 21 is connected to wire 18, a wire 9 of the coherer 8 being connected to said resistance. When the main circuit is energized, the electromagnets 16 and 19 are magnetized, the electromagnets 16 and 19 are magnetized, the electromagnet 5019 operating the lever 22, which is provided with the spring 23. When this lever is thus attracted, it contacts a post 24, which makes a circuit through the lever, wire 25, electromagnet 26, wire 27, batteries 28, and wire 29, this circuit operating a decohering55 device 26. When the main circuit is de-energized, the lever 22 is returned by its spring to make another circuit through its post 31, wire 32, electromagnet 33, wire 34, post 31, wire 32, electromagnet 33, wire 34, batteries 28, and wire 29, this circuit operating60 the decohering device 33. When a wave in the very first instant is received and before the coherers have fully conducted, the electromagnet 19 is affected very slightly, but enough so through its connections with the65 coherers and air and ground to cause the lever 22 to be moved slightly toward the electromagnet and out of contact with the post 31, but not in contact with the post 24, thus breaking the circuits of both of the 70decohering devices 26 and 33, which are then free to decohere the coherers 4 and 8, respectively, when the coherers both fully conduct and after one of the coherers has been decohered.
The electromagnet 16 when energized 75attracts the lever 36, which makes a circuit through wire 37, batteries 38, and wire 39 to operate the sounder 40.
B designates a transmitting-station.
From this description it will be seen that I80 have produced decohering devices which are adapted to be operated in succession and be dependent upon the waves as received by the receiving apparatus, this construction being vastly different from the constructions set85 forth in my application filed May 13, 1901, Serial No. 60,010, in which I have illustrated and claimed a series of coherers in the main circuit and independent means of decohering.90
The action in this arrangement or construction, as set forth in this application, is such that when a wave is received both of the coherers conduct, closing the main relay 16 and the relay 19, which in turn closes the 95circuit of the magnet 26 and causers the coherer 4 to be decohered. As soon as this action takes place the magnet 19 becomes demagnetized and circuit is made with magnet 33, which in turn operates the decohering device100 of the coherer 8; but by this time coherer No. 4 again conducts, and thus this action is re-