Vintage Traverse Plane-table Survey Alidale U.S. similar to Osborne Fire finder For Sale

It’s similar to an Osborne FireFinder. (Sort of?)

This Alidale is used in conjunction with a plane (or plain)table.

And a topographic map (maybe?).

Includes a Trough Compass,stamped U.S.

Includes an Alidale, made from solid brass, withvertical vanes used for sighting with a spirit level in the center. It has a Fiducial edge (scale/ruler) of10-inch and graduated in 1/50-Inch.

A sight vane is provided at each end of the ruler.

The vane with narrow slit serves as eye vane and the otherwith wide slit and having a thin wire at its centre serves as object vane.

The two vanes are hinged at the ends so that when not in use they can be folded.

The object vane has a vertical crosshair with a slide andStadia marks of 1 Div. = 10 Mils. Its base is stamped U.S. and is made fromsolid brass.

The instrument fits into itsleather case, which isalso marked U.S.

This instrument is a great teaching tool.

It’s cool and displays well.

Reference: theconstructor dot org

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