Difference between revisions of "Vickers F.T.P. Fire Control Instruments"

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After an initial effort with some [[Vickers Dial Fire Control Instruments|dial instruments]] [[Vickers]] manufactured a variety of [[Step-by-Step]] [[Fire Control Instrument]]s incorporating the [[F.T.P.|"follow-the-pointer"]] principle.   
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[[File:HFCI1914Plate15.jpg|thumb|640px|'''Vickers F.T.P. Instruments, c1914'''<ref>''Handbook of Fire Control Instruments, 1914'', Plate 15. </ref><br>The range receiver in the upper left is a Mark III. ]]
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After initial success supplying [[Vickers Dial Fire Control Instruments|dial instruments]], [[Vickers]] manufactured a variety of [[Step-by-Step]] [[Fire Control Instrument]]s incorporating the [[F.T.P.|"follow-the-pointer"]] principle.  They were first used in ''Boadicea'', around 1909, and regained Vickers the lead it had lost in 1906 to Barr and Stroud in supplying sightsetting instruments.
  
 
==Mark I==
 
==Mark I==
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TODO:
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These were electrically similar to the [[Vickers Dial Fire Control Instruments|dial instruments]] Vickers had previously provided.  A chopper handle built into the switch at the transmitter lifted the brushes off the rotor when the indication was not being driven.<ref>''Handbook of Fire Control Instruments, 1914'', p. 18. </ref>  They were only used in Boadicea,<ref>''Handbook of Fire Control Instruments, 1914'', p. 72. </ref> although one source<ref>''Handbook of Fire Control Instruments, 1909'', p. 57.</ref> indicates they were also used in ''Bellona''.
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* HFCI Plate 11 Mark I FTP diagram
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* HFCI Plate 12 Mark I FTP tx
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{|border=1
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!colspan=2| Mark I Pattern Numbers<br>for 4-inch guns<ref>''Handbook of Fire Control Instruments, 1914'', p. 21. </ref>
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|-
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!Device||Pattern No.
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|-
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|Range Transmitter||2643
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|-
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|Range Receiver||2645
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|-
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|Deflection Transmitter||2644
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|-
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|Deflection Receiver||2646
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|}
  
 
==Mark II==
 
==Mark II==
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TODO:
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These were considerably different from the Mark I, internally, by having a brushless design.<ref>''Handbook of Fire Control Instruments, 1914'', p. 18. </ref>  The range transmitter did not transmit pulses equating to any given range increment, but one rotation of the handle moved the pointer a quarter degree.  In deflection, one revolution yielded 1.5 knots of deflection.<ref>''Handbook of Fire Control Instruments, 1914'', p. 19. </ref>
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* HFCI Plate 13 Mark II FTP diagram
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* HFCI Plate 14 Mark II FTP tx+rx
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{|border=1
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!colspan=3| Mark II Pattern Numbers<br>for given guns<ref>''Handbook of Fire Control Instruments, 1914'', p. 21. </ref>
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|-
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!Device||4-in guns||6-in guns
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|-
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|Range Transmitter||2651||2647
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|-
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|Range Receiver||2652||2648
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|-
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|Deflection Transmitter||2653||2649
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|-
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|Deflection Receiver||2654||2650
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|}
  
 
==Mark III==
 
==Mark III==
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TODO:
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These were similar to the Mark II, electrically, but differed by having the receiver not be part of the sight, rendering it cheaper and simpler in construction.  Also, the transmitter did not have a sight dial as a tell-tale &mdash; simply a drum transmitter and repeat receiver.<ref>''Annual Report of the Torpedo School, 1909'', p. 148.</ref>
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* HFCI Plate 15 Mark III FTP
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* HFCI Plate 16 Mark III FTP details
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These differed from Mark II by having the receiver not be part of the sight, rendering it cheaper and simpler in construction, and the transmitter did not have a sight dial as a tell-tale; simply a drum transmitter and repeat receiver.<ref>''Annual Report of the Torpedo School, 1909'', p. 148.</ref>
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Although the Mark III devices differed by the sights they were fitted to, when delivered on a base plate alone, the Pattern numbers were as follows.
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 +
{|border=1
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!colspan=3| Mark III Pattern Numbers<br>without sight dial<ref>''Handbook of Fire Control Instruments, 1914'', p. 21. </ref>
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|-
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!Device||Pattern No.
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|-
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|Range Transmitter||2660
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|-
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|Range Receiver<br>Range Repeat Receiver||2662
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|-
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|Deflection Transmitter||2661
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|-
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|Deflection Receiver<br>Deflection Repeat Receiver||2679
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|}
  
 
==Mark III*==
 
==Mark III*==
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The transmitters of the Mark III* devices could use [[Cross-connecting Gear]] by virtue of their wheel gearing.<ref>''Annual Report of the Torpedo School, 1909'', p. 148.</ref>
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[[File:HFCI1914Plate10.jpg|thumb|300px|'''Vickers Cross-connecting gear'''<ref>''Handbook of Fire Control Instruments, 1914'', Plate 10. </ref> ]]
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These transmitters (which worked with Mark III receivers) could use [[Cross-connecting Gear]] by virtue of their wheel gearing, permitting them to drive two or more transmitters by the action of one man at the mechanical transmitter box.<ref>''Annual Report of the Torpedo School, 1909'', p. 148.</ref>
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The range transmitter was Pattern 2690 and the deflection transmitter Pattern 2691.<ref>''Handbook of Fire Control Instruments, 1914'', p. 21. </ref>
  
 
==Mark IV*==
 
==Mark IV*==
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These transmitters  (which worked with Mark III receivers) were being introduced around 1914 to be first tried in the [[Queen Elizabeth Class Battleship (1913)|''Queen Elizabeth'' class]] and featured an improved cross-connecting gear arrangement for the transmitter.<ref>''Handbook of Fire Control Instruments, 1914'', p. 20. </ref>
  
 
==See Also==
 
==See Also==

Revision as of 16:01, 22 April 2011

Vickers F.T.P. Instruments, c1914[1]
The range receiver in the upper left is a Mark III.

After initial success supplying dial instruments, Vickers manufactured a variety of Step-by-Step Fire Control Instruments incorporating the "follow-the-pointer" principle. They were first used in Boadicea, around 1909, and regained Vickers the lead it had lost in 1906 to Barr and Stroud in supplying sightsetting instruments.

Mark I

These were electrically similar to the dial instruments Vickers had previously provided. A chopper handle built into the switch at the transmitter lifted the brushes off the rotor when the indication was not being driven.[2] They were only used in Boadicea,[3] although one source[4] indicates they were also used in Bellona.

Mark I Pattern Numbers
for 4-inch guns[5]
Device Pattern No.
Range Transmitter 2643
Range Receiver 2645
Deflection Transmitter 2644
Deflection Receiver 2646

Mark II

These were considerably different from the Mark I, internally, by having a brushless design.[6] The range transmitter did not transmit pulses equating to any given range increment, but one rotation of the handle moved the pointer a quarter degree. In deflection, one revolution yielded 1.5 knots of deflection.[7]

Mark II Pattern Numbers
for given guns[8]
Device 4-in guns 6-in guns
Range Transmitter 2651 2647
Range Receiver 2652 2648
Deflection Transmitter 2653 2649
Deflection Receiver 2654 2650

Mark III

These were similar to the Mark II, electrically, but differed by having the receiver not be part of the sight, rendering it cheaper and simpler in construction. Also, the transmitter did not have a sight dial as a tell-tale — simply a drum transmitter and repeat receiver.[9]

Although the Mark III devices differed by the sights they were fitted to, when delivered on a base plate alone, the Pattern numbers were as follows.

Mark III Pattern Numbers
without sight dial[10]
Device Pattern No.
Range Transmitter 2660
Range Receiver
Range Repeat Receiver		 2662
Deflection Transmitter 2661
Deflection Receiver
Deflection Repeat Receiver		 2679

Mark III*

Vickers Cross-connecting gear[11]

These transmitters (which worked with Mark III receivers) could use Cross-connecting Gear by virtue of their wheel gearing, permitting them to drive two or more transmitters by the action of one man at the mechanical transmitter box.[12]

The range transmitter was Pattern 2690 and the deflection transmitter Pattern 2691.[13]

Mark IV*

These transmitters (which worked with Mark III receivers) were being introduced around 1914 to be first tried in the Queen Elizabeth class and featured an improved cross-connecting gear arrangement for the transmitter.[14]

See Also

Footnotes

  1. ↑ Handbook of Fire Control Instruments, 1914, Plate 15.
  2. ↑ Handbook of Fire Control Instruments, 1914, p. 18.
  3. ↑ Handbook of Fire Control Instruments, 1914, p. 72.
  4. ↑ Handbook of Fire Control Instruments, 1909, p. 57.
  5. ↑ Handbook of Fire Control Instruments, 1914, p. 21.
  6. ↑ Handbook of Fire Control Instruments, 1914, p. 18.
  7. ↑ Handbook of Fire Control Instruments, 1914, p. 19.
  8. ↑ Handbook of Fire Control Instruments, 1914, p. 21.
  9. ↑ Annual Report of the Torpedo School, 1909, p. 148.
  10. ↑ Handbook of Fire Control Instruments, 1914, p. 21.
  11. ↑ Handbook of Fire Control Instruments, 1914, Plate 10.
  12. ↑ Annual Report of the Torpedo School, 1909, p. 148.
  13. ↑ Handbook of Fire Control Instruments, 1914, p. 21.
  14. ↑ Handbook of Fire Control Instruments, 1914, p. 20.

Bibliography

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