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TIME - DISTANCE   COMPUTER
(  1  3/16"   =   Scales-Diameter   =   30 mm  )

(1st) AS A PENDANT



(2nd) AS A CLIP


YES, They are  S L I D E   R U L E S  !!!      ( made in 1950 )
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With Marks:      π   MILES   GAL   KM   KT   ST   MIN   HR

Have a look at a LIGHTER (= 3rd) Version
There is a   » BENDIX TROPHY FLIGHT COMPUTER «   too ...

impressum:
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© C.HAMANN   http://public.beuth-hochschule.de/~hamann   02/02/13