This old drafting tool is an adjustable head T-square from the Frederick Post company. There is both a fast or stationary head and a loose adjustable head. Apparently, this style of T-square could be used to create straight lines at different angles without the use of additional instruments like triangles. Gnarled knobs on threaded posts loosen the head to swivel the moveable head. The heads appear to be wood with a black finish and one side has the oval Post trademark and the model 1840-18. The straight edge appears to be made of a light wood, probably boxwood, with Lucite like plastic edges. I believe this is from the 1940’s – 1950’s.
It measures about 19 7/8” in total length. The straight edge measures about 18” to the bottom edge of the head and about 2” wide. The head measures about 9” wide. It is in generally good condition with average signs of use including a little loss of paint on the head and light nick and scratch wear to the plastic.
The pictures are not shown at actual size. Please refer to the description for actual measurements.
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