A 6″ ruler made from wood and celluloid with etchings for different fractions and multiples of an inch on both sides. The ruler has a…
A 5″ slide rule made with astralon and plexiglass. This slide rule is designed in the rietz style common to many German slide rules. The…
A 5″ all-metal pocket slide rule, made of aluminum, with grooves on the slide, the special “Eye Saver” (ES) design with yellow background and black…
A 10″ slide rule made of a light-weight wood (possibly bamboo or boxwood) with a celluloid coating. The slide has ridges and the stock is…
This 10″ slide rule is made of an aluminum body with grooved slide and plastic cursor attached to the stock by the aid of two…
A 10″ slide rule made of mahogany, framed with celluloid, with a plastic cursor with single hairline. The cursor has plastic ends. This is a…
A 10″ all aluminum slide rule with a plastic unframed cursor and aluminum stops. The slide has ridges and stock is grooved. This is a…
This 10″ slide rule is made of a magnesium body (stock and slide) and steel stops. The slide has ridges and the stock is grooved.…
A 10″ slide rule with a magnesium body (stock and slide) and steel stops. The slide has ridges and the stock is grooved. The cursor…
A 6″ plastic abacus. It is a 1/4 abacus, meaning that there is one bead at the top and four at the bottom of the…