Warren-Knight Model ML- 474-GM Pibal Theodolite
This page contains photos and descriptions of the Warren-Knight ML-474-GM Pilot Balloon
Theodolite. The ML-474-GM is the Mil. Spec. Version of the Warren-Knight Model
series of pilot balloon theodolite. This series was formally produced by David White
and some variants also by Seiler Instruments. Currently these units are manufactured
as 20-8403 and have a different color scheme and battery box. See the Warren-Knight 8403 page for details.
Warren-Knight also produced a number of these in a black crinkle paint sceme.
|In this front view you can see the battery box
on the far left, main objective, finder objective and vertical circle tangent screw.
||In this view you can see the front bubble level,
both tangent screws with micrometer drums, vertical circle and horizontal circle (under
window), lighting rheostat and the finder scope and switch switch.
|This is a similar view to the detail view above
right showing the entire theodolite mounted on its tripod with lens shade and rubber
||In the rear view you can see the horizontal
tangent screw micrometer, lighting switch, battery box, focus knob (only effects main
objective), gun site and the compass (rectangular object with the red pointer)
Engaging Tangent Screw
||42 mm 21x
leveling head, 3.5"x8tpi
Volt lamps, scales
2 way foldable pair, main telescope