Alidade compass is one of the best compasses, and looks beautiful because of its design in which there is a telescope followed by one compass.fully extended telescope is mounted with bubble level. Alidade is mounted on brass metal base which has 3 adjustable screws. Nice quality reproduction for surveyors to align and measure vertical and horizontal angles.This solid brass nautical gem features a real working 8-powered telescope. Nautical Brass Table Compass small alidade compass classical brass antique , Small working compas Compass Specification:- Height: 4 inches tube 4 inches Material used: brass and polished to antique finish Brass Desk Theodolite Compass, Material Used : Brass , Finish : Antique Brass Perfection: Designed to be perfect for outdoors or even to be seen on display in your home as a unique conversation piece!