Position plotter. Consists of thee clear perspex arms 8.0" (20.3 cm) long, each with a vertical sight fin at one end 3.0" (7.6 cm) high, pivoted at the other end above a graduated base. The base is graduated to 360 degrees and has an arm 11.5" (29.2 cm) long which is fitted with a rubber cheek pad at end. A rotatable mirror 4.5" x 2.0" (11.4 x 5.1 cm) is mounted above pivot point of instrument.
In a polystyrene box: 12.0" x 6.0" x 4.0" (30.5 x 15.2 x 10.2 cm)