Pattern 2140 Navyphone
The Pattern 2140 Navyphone was a British Navyphone used in the Royal Navy, intended for ordinary working or fire control.[1] In modern parlance, it would be called an intercom, and very similar to the Pattern 1855 Navyphone, differing only in having its call-up push on the right rather than the left and in that its transmitter and receiver were "more efficient".[2] It first appeared around 1902 along with the Pattern 1856 Navyphone which was intended for use in engine rooms.[3]
Form Factor
The 2140 was bulkhead mounted in a cylindrical iron chassis, possibly around 15cm across.[4] It had a push-to-talk lever marked Press whilst talking[5] (or Press whilst speaking[6]) on the right side and a speaking transmitter on its face. Like many navyphones, its speaker was inside and faced rearward; a metallic horn around 60mm at its mouth came out from beneath the chassis and projected the remote speaker's voice out to the local listener.
A call button located on the right side.[7] sufficed to ring the bell at both the local and remote terminals.[Citation needed] The bells were not themselves an integral part of the navyphone.[8]
The transmitter could probably be revolved (by rolling about its axis)[9] "to shake up the carbon granules"[10] as in the Pattern 1855.
Like most navyphones before those used in Lord Nelson, Bellerophon and later classes, these phones were battery-powered, probably powered in pairs off six pattern 1453 cells in a pattern 1704 battery box near one of the two.[11] This box was separate.
Service Life
These phones were almost certainly obsolete by 1924, by which time only phones in the 2460 and 3330 series were in general use.[12]
See Also
Footnotes
- ↑ Torpedo Drill Book, 1914, p. 262.
- ↑ Torpedo Drill Book, 1914, p. 262.
- ↑ Annual Report of the Torpedo School, 1902, p. 60.
- ↑ inferred from Pattern 1855 Annual Report of the Torpedo School, 1902, Plate 25.
- ↑ Annual Report of the Torpedo School, 1902, p. 60.
- ↑ Torpedo Drill Book, 1914, p. 259.
- ↑ Torpedo Drill Book, 1914, p. 262.
- ↑ Annual Report of the Torpedo School, 1907, Plate 10.
- ↑ Electrical Drill Book, 1924, p. 275.
- ↑ Torpedo Drill Book, 1914, p. 260.
- ↑ Torpedo Drill Book, 1914, p. 263.
- ↑ Electrical Drill Book, 1924, p. 286.
Bibliography
