Plane Table Alidade

Signature

Attributed to G.H. Brander, Germany

Location

Date

Circa 1770

Dimensions

English

Metric

Length

13.8in

350mm

Accessories

None

Description

This 1X inverting telescope is used to measure elevation using the inscribed brass protractor. The entire telescope is constructed of wood, possibly fruitwood. The lens caps and lens retaining rings are threaded wood. A sighting crosshair is located in the removable wood block. This block can be translated to focus the crosshair reticle. The body of the telescope is square in profile, and the objective is mounted in a square draw that can be extended for focusing. The instrument is not signed but is attributed to G. H. Brander.

College of Optical Sciences
The University of Arizona, 1630 East University Boulevard, Tucson, Arizona U.S.A. 85721-0094