Trough Compass from a Transit Theodolite late 19th or early 20th Century

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Trough Compass from a Transit Theodolite late 19th or early 20th Century:
$19.99

This is an brass cased trough compass from a large instrument, probably a transit theodolite. It has a beveled slot to one side, and needle clap lever on the other. It is 8 inches long.I am selling a collection of scientific and medical instruments and am happy to combine shipping.