SURVEYORS TROUGH COMPASS IN BOX, 1970's

Surveyors compass's, which have a needle with small sideways movements and few degree marks. Designed to be small and portable, would be used with maps on site.

Your comments:

• I have one of these trough compasses . I was owned by my family company : Pinaud's Yacht Yard Ltd. of Baddeck , Nova Scotia , Canada . It is as in the right hand photo exactly . I have no other pieces ; just the compass , which seems to work very well . Don't know the value or real usage technique . Thanks , Ralph
  .......... Ralph B. Pinaud, Lower Sackville , N.S. , Canada B4C1Y6, 28th of January 2017
  
  
• I saw another trough compass like the one on the left in a private collection in Ontario, Canada. The surveyor was active in the first half of the 20th century. These compasses were used to mark magnetic north accurately on a plat on a plane table.
  .......... Julian Bullitt, Newton, MA, United States, 31st of July 2012
  
  

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