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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Letter from H.M. Hobson Components regarding a proposed dual instrument gauge and a tested Heat Indicator.

Identifier  ExFiles\Box 175\4\  img215
Date  7th August 1936
  
x6003
CONTRACTORS TO THE ADMIRALTY, WAR OFFICE, AIR MINISTRY AND TO THE DOMINION & FOREIGN GOVERNMENTS.
PLEASE ADDRESS ALL COMMUNICATIONS TO THE FIRM, NOT TO INDIVIDUALS.
H.M. HOBSON (AIRCRAFT AND MOTOR) COMPONENTS, LTD.
H.M. HOBSON LTD. (Founded 1903)
INCORPORATING ACCURACY WORKS LTD. (Founded 1911)
FLOATS LTD. (Founded 1920)
REGISTERED OFFICES & WORKS,
47-55, THE VALE, ACTON, LONDON, W.3.
TELEGRAMS: ASSEMBLAGE, PHONE, LONDON.
TELEPHONE: SHEPHERDS BUSH 3321 (4 LINES)
WORKS,
ACCURACY WORKS, WOLVERHAMPTON.
TELEGRAMS: ACCURACY, WOLVERHAMPTON.
TELEPHONE: WOLVERHAMPTON 20786.
DIRECTORS:
T.P. SEARIGHT (CHAIRMAN.)
W. M.{Mr Moon / Mr Moore} ILIFF
H.{Arthur M. Hanbury - Head Complaints} BURROUGHES.
S. W. HUGHES.
J.{Mr Johnson W.M.} MONTGOMERIE.
E.{Mr Elliott - Chief Engineer} DODSON.
Manufacturers of
CLAUDEL-HOBSON CARBURRETTERS
HOBSON K-S TELEGAGES
HOBSON-PERFECT INDOW REGULATORS
HOBSON SPARKING PLUGS
AND THE HOBSON SYSTEM OF AIRCRAFT ENGINE MASTER CONTROLS
PLEASE REPLY TO -> 47-55, THE VALE, ACTON, LONDON, W.3.
ENCLO.
OUR REF. TPS/AML
YOUR REF. Hs{Lord Ernest Hives - Chair}/Std.18/MA.
7th August, 1936.
Messrs. Rolls-Royce Ltd.,
Derby.
honed Hs{Lord Ernest Hives - Chair}/StD
For the attention of Mr. Steadman.
Dear Sirs,
We beg to thank you for yours of the 4th August, with reference to your conversation with our Mr. Reigate, whose report on the matter we have now had.
We also have to thank you for your drawing D.75213, showing us the arrangement of your present dual Water Thermometer and Oil Pressure Gauge. We have accordingly put forward a suggestion on a Sketch No. 456, which we enclose for your consideration, showing the overall dimensions which could be kept by a dual instrument using our components.
We fear it is utterly impossible for us, with the system upon which our gauge works, to give 180° scale, which you have approximately on your two present instruments. We have shown what we can do in connection with this matter, but unfortunately the angular movement of the needle cannot be increased.
(a) With regard to the Heat Indicator which was loaned you for trial, we have now received this back and have tested it. Under the conditions of our test rig
  
  


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