Pattern 2140 Navyphone

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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]

Pattern 2140 Navyphone[4]
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

  1. Torpedo Drill Book, 1914, p. 262.
  2. Torpedo Drill Book, 1914, p. 262.
  3. Annual Report of the Torpedo School, 1905. p. 72.
  4. As shown in Torpedo Drill Book, 1914., p. 262
  5. inferred from Pattern 1855 Annual Report of the Torpedo School, 1902, Plate 25.
  6. Annual Report of the Torpedo School, 1902. p. 60.
  7. Torpedo Drill Book, 1914, p. 259.
  8. Torpedo Drill Book, 1914, p. 262.
  9. Annual Report of the Torpedo School, 1907. Plate 10.
  10. Electrical Drill Book, 1924, p. 275.
  11. Torpedo Drill Book, 1914, p. 260.
  12. Torpedo Drill Book, 1914, p. 263.
  13. Electrical Drill Book, 1924, p. 286.

Bibliography

  • H.M.S.O., London (1914). Torpedo Drill Book, 1914 (Corrected to May 15) Copy in Tony Lovell's library.
  • H.M.S. Vernon. Annual Report of the Torpedo School, 1905, with Appendix (Wireless Telegraphy). Copy 22 at The National Archives. ADM 189/25.
  • H.M.S. Vernon. Annual Report of the Torpedo School, 1907, with Appendix (Wireless Telegraphy). Copy 9 at The National Archives. ADM 189/27.
  • D.T.M. Department, Admiralty (1924). Electrical Drill Book. O.U. 5317. Copy in Tony Lovell's library.