Having standard winding of 2-5-50 or 2,50,500. The bakelite ring with winding it mounted on bakelite base with four terminals. No. of turns is marked betwee the terminals. Th whole assembley rotates on a non magetic tripod base with non magnetic levling screw, Compass box is mounted on non- magetic metallic cup and is free to roated around it. Compass box is graduated in degrees. Avaialbe in Alumminu Parts / Brass Parts