Demonstration model of astatic galvanometer consisting of a mahogany base with three large leveling screws, a brass frame for a thick copper wire coil with black silk insulation, and a simple suspension for the astatic needles. The instrument is housed in a six-sided mahogany frame with six glass panels. The scale is a large ring brass graduated in four quadrants of 0°-90°, and the coil is connected to two brass terminals with clamps.