Folding "aide-memoire" sector for fortification design. Set with brass hinge and numerous brass pins at critical points for use with dividers. Scales of chords, polygons, and equal parts. Edge scales of English inches, powder proof, weight of powder, etc. for DC (demi-culverin), WC, BC, etc. Summarizes complex fortification geometries used by various European designers, including Count Pagan 1650, Emperor Ferdinand III 1650, Fritach 1635, etc.
Материал
Four ivory panels labeled "Italian, French, Dutch, English"
