Difference between revisions of "Torpedo Deflection Sight Mark IV"
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| − | + | [[File:ARTS1918Plate110.jpg|thumb|400px| '''Periscope of T.D.S. Mark IV'''<ref>''Annual Report of the Torpedo School, 1918'', Plate 110.</ref><br>Notice open sights alongside, which would not afford the user the blast protection.]] | |
| + | [[File:ARTS1918Plate112.jpg|thumb|400px| '''T.D.S. Mark IV*'''<ref>''Annual Report of the Torpedo School, 1918'', Plate 112.</ref><br>Depicted here with the Loose Gyro Bearing Ring fitted.]] | ||
| + | [[File:ARTS1918Plate113.jpg|thumb|400px| '''T.D.S. Mark IV*'''<ref>''Annual Report of the Torpedo School, 1918'', Plate 113.</ref><br>Depicted here with the Loose Gyro Bearing Ring fitted.]] | ||
| + | The '''Torpedo Deflection Sight Mark IV Types''' were actually a family of British [[Torpedo Deflection Sight|torpedo deflection sights]]. | ||
| + | |||
| + | Being supplied to BBs and BCs with 21-in torpedoes for use in armoured control positions (C.M.O. 3977 of 1917, G. 14352/17)<ref>''Annual Report of the Torpedo School, 1917'', p. 190.</ref> | ||
| + | These were made in port and starboard 'handed' sides, and for various angles of tube inclination. "a" for starboard, "b" for port. | ||
| + | * Mark IVa and IVb for ships with tubes at 90 degrees (Hood, Repulse, Courageous, Royal Sovereign, Colossus and Lion classes, and Furious and Orion | ||
| + | * IV*a and IV*b for ships with forward tubes at 80 degs and aft at 100 degs: Queen Elizabeth and Iron Duke classes | ||
| + | * IV**a and IV**b for ships with tubes at 80 degs: King George V class and Orion class except Orion | ||
| + | * IVa (special) and IVb (special) for ships with tubes at other assorted inclinations: Tiger, Canada, Agincourt, and Erin | ||
| + | |||
| + | The differences between the sights was limited to the gyro angle scale and reader. | ||
| + | The first four were delivered in Feb 1917 to Warspite for trial. Report was highly satisfactory and justified the decision to adopt them for heavy gun ships. | ||
| + | Concerns of blast and the desire to drive the TC Evershed (see ARTS 1917 page 208) from the sight prompted interest in moving from telescope to periscope binos. | ||
| + | |||
| + | These sights were to be provided two per ship by C.I.O 3977 of 1917, and by the end of 1918, all ships had been so fitted.<ref>''Annual Report of the Torpedo School, 1918'', p. 157.</ref> | ||
| + | |||
| + | Unfortunately, the proposal to add binocular periscopes to better shield the user from gun blast was found unworkable for the added weight (50 pounds!) and a lighter design did not seem easily achievable given other commitments. As a result, a monocular periscope of field 13 degrees and power 3 was chosen that could be elevated or depressed 12.5 degrees. The periscope was to be kept in its storage box when not in use. A set of coloured shades for the eyepiece were provided. | ||
| + | |||
| + | The periscope proved satisfactory to the degree that it was proposed that the Evershed torpedo control transmitter should be placed here rather than on the torpedo rangefinder. | ||
| + | |||
| + | By mid 1919, ''Royal Sovereign'', ''Benbow'', ''Iron Duke'' ''Lion'' ''Emperor of India'' ''Marlborough'', ''Ramillies'' and ''Queen Elizabeth'' were completely equipped and ''Renown'' had two. Other existing T.D.S. Mark IVs were to be adapted for the periscope at the next refit.<ref>''Annual Report of the Torpedo School, 1918'', pp. 157-158.</ref> | ||
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| + | ==See Also== | ||
| + | |||
| + | ==Footnotes== | ||
| + | {{reflist}} | ||
| + | |||
| + | ==Bibliography== | ||
| + | {{refbegin}} | ||
| + | {{refend}} | ||
| + | |||
| + | {{TorpedoDirector}} | ||
Revision as of 15:45, 1 April 2011
Notice open sights alongside, which would not afford the user the blast protection.
The Torpedo Deflection Sight Mark IV Types were actually a family of British torpedo deflection sights.
Being supplied to BBs and BCs with 21-in torpedoes for use in armoured control positions (C.M.O. 3977 of 1917, G. 14352/17)[4] These were made in port and starboard 'handed' sides, and for various angles of tube inclination. "a" for starboard, "b" for port.
- Mark IVa and IVb for ships with tubes at 90 degrees (Hood, Repulse, Courageous, Royal Sovereign, Colossus and Lion classes, and Furious and Orion
- IV*a and IV*b for ships with forward tubes at 80 degs and aft at 100 degs: Queen Elizabeth and Iron Duke classes
- IV**a and IV**b for ships with tubes at 80 degs: King George V class and Orion class except Orion
- IVa (special) and IVb (special) for ships with tubes at other assorted inclinations: Tiger, Canada, Agincourt, and Erin
The differences between the sights was limited to the gyro angle scale and reader. The first four were delivered in Feb 1917 to Warspite for trial. Report was highly satisfactory and justified the decision to adopt them for heavy gun ships. Concerns of blast and the desire to drive the TC Evershed (see ARTS 1917 page 208) from the sight prompted interest in moving from telescope to periscope binos.
These sights were to be provided two per ship by C.I.O 3977 of 1917, and by the end of 1918, all ships had been so fitted.[5]
Unfortunately, the proposal to add binocular periscopes to better shield the user from gun blast was found unworkable for the added weight (50 pounds!) and a lighter design did not seem easily achievable given other commitments. As a result, a monocular periscope of field 13 degrees and power 3 was chosen that could be elevated or depressed 12.5 degrees. The periscope was to be kept in its storage box when not in use. A set of coloured shades for the eyepiece were provided.
The periscope proved satisfactory to the degree that it was proposed that the Evershed torpedo control transmitter should be placed here rather than on the torpedo rangefinder.
By mid 1919, Royal Sovereign, Benbow, Iron Duke Lion Emperor of India Marlborough, Ramillies and Queen Elizabeth were completely equipped and Renown had two. Other existing T.D.S. Mark IVs were to be adapted for the periscope at the next refit.[6]
See Also
Footnotes
- ↑ Annual Report of the Torpedo School, 1918, Plate 110.
- ↑ Annual Report of the Torpedo School, 1918, Plate 112.
- ↑ Annual Report of the Torpedo School, 1918, Plate 113.
- ↑ Annual Report of the Torpedo School, 1917, p. 190.
- ↑ Annual Report of the Torpedo School, 1918, p. 157.
- ↑ Annual Report of the Torpedo School, 1918, pp. 157-158.
Bibliography
