Disque de calcul M1. US M1 calculating disk

Description du lot

Disque de calcul M1. En bakélite blanc. Nombreux marquages de calculs. Deux flèches permettant de calculer les distances. Vis centrale en laiton. Marquages Rule Slide M1 No 3707 Insp WPB 1943. Fabrication The Sillcocks Miller Company B 174703. Diamètre 30 cm. A noter une certaine usure et patine de la pièce. Etat II+. M1 calculating disk White bakelite construction with numerous calculation markings and two arrows for distance computation. Brass central screw. Marked Rule Slide M1 No 3707 Insp WPB 1943, made by The Sillcocks Miller Company B 174703. Diameter 30 cm. Showing expected wear and patina. Condition II+.