This instrument, made of brass or plastic, consists of a circular scale that can be read to fractions of a degree or minutes of arc, and to which the three arms are attached. The two angles measured are plotted using a three-arm protractor. ![]() K&E Xylonite brand plastic did have a yellow tint, but this item is not marked with that brand name. No marks of any type on tray.ĭial scale reads 0 to 180 degrees in both left and right directions the left side only has an additional inner scale for 180-360 degrees. ![]() K&E logo and griffin trademark do not appear on the item. K&E had their main office and factories in Hoboken at this time including U.S. See notes.Ī non-catalog model (number 7136 is not in catalog sequences of the period) produced under contract with the Bureau of Ships for World War II military service. It also had applications in firing range plotting. This device was typically used for determining a ship’s position using sextant angles. Two holes in masonite in tapered area where it appears it could be screwed to wall the wood edge at the very top has another through hole. One edge is damaged which may have been an attachment point for any cover or lid no cover is present. Typewritten label inside tray: Please Return Protractor to Case Each Time After Being Used. With: custom shaped wood storage tray, 12-3/4" wide x 20-3/8" long x 13/16" high, with masonite base three fixed wood blocks to hold instrument in place. Brass center pivot has a hole for marking or pinning the instrument in place each arm has three pencil holes along black line for scribing a fixed diameter arc, but there are no scales marked on the arms. The base arm and adjustable arms have a hang hole in a common position for hanging storage. Dial 12-1/8" diameter with one fixed arm 19-1/2" high two adjustable arms 13-1/2" long x 3-1/4 overall width. Transparent (slight yellow cast) celluloid plastic with markings in black 2 brass clamps with molded black plastic knobs. Made by Keuffel & Esser Co., New York, no date, probably 1942. ![]() Three-arm circular protractor made for the U.S.
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