Grey painted brass circle. Prism mounting bracket, two-legged with tubular spirit level mounted across. Prism 45 x 33mm with engraved sighting line and adjustable in elevation by milled knob. Opposite is a curved brass counter-balance weight mounted on the circle.
Wooden case-Mahogany 245 x 247 x 130mm, baize lined and fitted. Instructions on label in base. Weights and thread in lid compartment. Leather strap.