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"Cosim" Variometer (sensitive rate of climb indicator)



 
 
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Old December 20th 17, 06:32 PM posted to rec.aviation.soaring
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Default "Cosim" Variometer (sensitive rate of climb indicator)

I have a NOS COSIM Variometer for sailplane, gliders and it was manufactured by Cobb-Slater Instrument CO., LTD., Matlock, England in the 1940 and 1960. It's a pellet type of indicator in a bakelite brown enclosure, it measuring unit is ft/sec, a red pellet for downward and a green pellet for upward movement. It would be appreciated if someone knows what this variometer is worth. Thank you
 




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