Pattern 2140 Navyphone
The Pattern 2140 Navyphone was a Graham-type navyphone used in the Royal Navy, intended for ordinary working or for 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 entered service in 1905.[3]
Presumably, the little circle at upper right is the call-up button, but descriptions c1902 indicate this push was on the left side.
Form Factor
The 2140 was bulkhead mounted in a cylindrical iron chassis, possibly around 15cm across.[5] It had a push-to-talk lever marked Press whilst talking[6] (or Press whilst speaking[7]) 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.[8] 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.[9]
The transmitter could probably be revolved (by rolling about its axis)[10] "to shake up the carbon granules"[11] 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.[12] 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.[13]
See Also
Footnotes
- ↑ Torpedo Drill Book, 1914, p. 262.
- ↑ Torpedo Drill Book, 1914, p. 262.
- ↑ Annual Report of the Torpedo School, 1905, p. 72.
- ↑ As shown in Torpedo Drill Book, 1914., p. 262
- ↑ 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
- Template:BibUKTorpedoDrillBook1914
- Template:BibUKARTS1905
- Template:BibUKARTS1907
- Template:BibUKElectricalDrillBook1924
