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PENDULUM TYPE INCLINOMETER. One of the 



simpler pieces of apparatus used at Bikini was this 

 pendulum-type inclinometer used to measure pitch 

 and roll of target ships. Although any sea voyager 

 knows in a general way what constitutes pitch and 

 roll of a ship, scientifically these terms refer to the 

 angle with the vertical made by the ship's long 

 and short axes. Each instrument contained identi- 

 cal assemblies mounted at right angles as shown. 

 The weighted arm was designed to remain vertical 

 at all times, angle of pitch or roll being measured 

 and recorded as scratches on the shiny discs pro^ 

 vided. 



