previous next

Tel′e-graph-key.


Telegraphy.) The vibrating piece in a transmitting-instrument, which is touched by the finger to establish an electric circuit. See Morse alphabet, b, Fig. 3225, page 1476.

Farmer's magnetic telegraph.

Fig. 6251 shows a key in connection with Farmer's magnetic telegraph for sending messages simultaneously in opposite directions upon a single line of telegraph. Upon the receivingmag-net is a single set of coils, and the key makes two contacts at the down stroke, closing the branch circuit through the receiving-magnet, and the branch through the rheostat, both at once, and at the same time disconnecting the receivingmag-net from the direct ground, and connecting with the ground through the battery. The rheostat branch circuit is broken at the key at its upward stroke. See also Fig. 2744, page 1225.

Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 United States License.

An XML version of this text is available for download, with the additional restriction that you offer Perseus any modifications you make. Perseus provides credit for all accepted changes, storing new additions in a versioning system.

hide Places (automatically extracted)

View a map of the most frequently mentioned places in this document.

Download Pleiades ancient places geospacial dataset for this text.

hide People (automatically extracted)
Sort people alphabetically, as they appear on the page, by frequency
Click on a person to search for him/her in this document.
Moses G. Farmer (1)
hide Dates (automatically extracted)
Sort dates alphabetically, as they appear on the page, by frequency
Click on a date to search for it in this document.
1476 AD (1)
1225 AD (1)
hide Display Preferences
Greek Display:
Arabic Display:
View by Default:
Browse Bar: