Vintage W + LE GURLEY Surveyors TRANSIT w Beaman Stadia Arc #1402 Very Rare

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Vintage W + LE GURLEY Surveyors TRANSIT w Beaman Stadia Arc #1402 Very Rare:
$379.99

Here is a rare find...A W. & L.E. Gurley surveyor\'s scope (transit) with the Beaman Stadia Arc attached. The scope is attached to a long steel base and has a level and then what appears to be a long narrow compass. Also included is an additional eyepiece of sorts that I think allows you to look down to view rather than looking straight through like a telescope. The scope and mount have some petina but everything works smoothly. There is also a cover for the front lens. This is a really nice piece for a collector. Below is the definition of a Beaman Stadia Arc.Shipping is $20 to the US.Definition of Beaman stadia arcA specially graduated arc attached to the vertical circle of an alidade or transit to simplify the computation of elevation differences for inclined stadia sights (without the use of vertical angles). The arc is so graduated that each division on the arc is equal to 100 (0.5 sin 2A), where A is the vertical angle. Named after William M. Beaman (1867-1937), U.S. topographic engineer, who designed it in 1904.