Martin Brenner's, Pilot Balloon Resources
WWII Vintage Tamaya Pilot Balloon Theodolite
The theodolite below was produced in 1943. It is the same model as used by Imperial Japanese Airforce during WWII this instrument also shows a navy anchor on its box name plate. As with the Tamaya Model BT-901 the main objective is not aligned with the horizontal center making this unit less than desirable for doubling as a surveying instrument. This theodolite includes lighting for the reticule (main eyepiece, only) and the azimuth and elevation scales. Unlike American designs and later Tamaya models, it uses two completely separate telescopes for wide angle and high power viewing.
The bubble levels on this theodolite have protective metal cylinders covering the glass. These covers can be rotated to expose the levels and closed to protect the levels from damage.
Prior to my acquisition this theodolite was in in the collection of a retired military officer in Australia who claimed it was liberated during the second world war.
Thanks to Rich Lane for pointing out the correct date of manufacture of this theodolite 18, 8 corresponding to 1943 and also pointing out the existence of the navy symbol on the label of this instrument.