Editing Geologists at war, 1914-1918

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== Design of aircraft compasses ==
 
== Design of aircraft compasses ==
 
[[File:P810111.jpg|thumb|150px|H H Thomas c.1912. © BGS/NERC (Image: P810111)]]
 
[[File:P810111.jpg|thumb|150px|H H Thomas c.1912. © BGS/NERC (Image: P810111)]]
In September 1916 the Geological Survey was contacted by the Admiralty Compass Department asking for assistance with the design of aircraft compasses. The problem was with the compass point and cup which were part of the bearing that allowed the compass needle to move. [[Herbert Henry Thomas|Herbert H Thomas]], a petrographer at the Survey, was given the task of finding a solution. The point and cup were both made out of sapphire, which caused the point to develop flaws and cracks. It was decided to still have the cup made out of sapphire but to use agate for the point. This combination turned out to be successful and solved the problem.
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In September 1916 the Geological Survey was contacted by the Admiralty Compass Department asking for assistance with the design of aircraft compasses. The problem was with the compass point and cup which were part of the bearing that allowed the compass needle to move. [[Herbert Henry Thomas|Herbert H Thomas]], a petrographer at the Survey, was given the task of finding a solution. The point and cup were both made out of sapphire, which caused the point to develop flaws and cracks. The answer was to still have the cup made out of sapphire but to use agate for the point.
  
 
== Analysis of concrete ==
 
== Analysis of concrete ==

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