Difference between revisions of "Barr and Stroud Mark IV Fire Control Instruments"

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(Created page with 'Barr and Stroud manufactured a large and evolving family of Step-by-Step Fire Control Instruments to convey ranges, deflections, orders and similar information throug…')
 
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[[Barr and Stroud]] manufactured a large and evolving family of [[Step-by-Step]] [[Fire Control Instruments]] to convey ranges, deflections, orders and similar information throughout a shipBy 1909, 2 main generations and one minor generation had been introduced.  By 1914, another 2 main generations and a minor generation had been introduced.
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[[Barr and Stroud]]'s Mark IV series of [[Step-by-Step|step-by-step]] [[Fire Control Instrument|fire control instruments]] were a modest upgrade from the Mark III* seriesAs they and the Mark III and III* series are outlined in the ''Handbook of Fire Control Instruments, 1914'' but not mentioned in the 1909 edition, Mark IV probably was introduced between 1911 and 1914.
  
==Mark IV Instruments==
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==Bearing Instruments==
 
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===Mark IV Bearing Instruments===
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These were nearly identical to the Mark II.* models.   
 
These were nearly identical to the Mark II.* models.   
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===Mark IV Rate Instruments===
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==Rate Instruments==
 
The Rate Transmitter (of unknown pattern number) was identical to the Mark III. except the shutter coils and digital drums are fed their input from without and not directly from the transmitter and shutter switches.  This allowed the tell-tale indicators to receive their data from a change-over switch, as though they were an ordinary receiver.  This removed the need for a COS to have its own tell-tale indicator in cases where it was going t o be placed adjacent to the transmitter anyway.
 
The Rate Transmitter (of unknown pattern number) was identical to the Mark III. except the shutter coils and digital drums are fed their input from without and not directly from the transmitter and shutter switches.  This allowed the tell-tale indicators to receive their data from a change-over switch, as though they were an ordinary receiver.  This removed the need for a COS to have its own tell-tale indicator in cases where it was going t o be placed adjacent to the transmitter anyway.
  

Revision as of 09:47, 23 September 2009

Barr and Stroud's Mark IV series of step-by-step fire control instruments were a modest upgrade from the Mark III* series. As they and the Mark III and III* series are outlined in the Handbook of Fire Control Instruments, 1914 but not mentioned in the 1909 edition, Mark IV probably was introduced between 1911 and 1914.

Bearing Instruments

These were nearly identical to the Mark II.* models.

The Pattern 3139 Bearing Receiver's STARBOARD/PORT shutter had a third face added to the bottom, which was blank and it had no blank/TRAIN shutter. I do not understand why this would be considered an improvement unless the digit display can go all the way up to 360 (or down to -180), and this was intended to be used with the blank face of the shutter on display.

The Pattern 3138 Bearing Transmitter had handles and a lower gearbox.


Rate Instruments

The Rate Transmitter (of unknown pattern number) was identical to the Mark III. except the shutter coils and digital drums are fed their input from without and not directly from the transmitter and shutter switches. This allowed the tell-tale indicators to receive their data from a change-over switch, as though they were an ordinary receiver. This removed the need for a COS to have its own tell-tale indicator in cases where it was going t o be placed adjacent to the transmitter anyway.

See Also

Footnotes

Bibliography