Draft-a-Plan student slide rule
Date: circa 1962
Inventory Number: 1997-1-1636
Classification: Slide Rule
Subject:
Maker: Engineering Instruments, Inc. (1948-1967)
Cultural Region:
Place of Origin:
Peru,
Dimensions:
1 × 15.9 × 3 cm (3/8 × 6 1/4 × 1 3/16 in.)
box: 1.6 × 16.7 × 3.3 cm (5/8 × 6 9/16 × 1 5/16 in.)
Accessories: cardboard box for storage; instruction book (stored with instrument)
Description:
Rectangular wooden rule with three slides, faced with white celluloid (?). The top and bottom slides are fixed; the center slide moves to left and right. A glass runner, with a vertical indicating line and a brass (?) frame, also moves to left and right.
Printed along the bottom edge of the top, fixed slide and the top edge of the center, moveable slide are, respectively, "A" and "B" scales. These are composed of two logarithmic scales (values 1 to 10) placed side by side. Printed along the bottom edge of the center, moveable slide and the top edge of the bottom, fixed slide are logarithmic scales carrying values from 1 to 10 and labeled "C" and "D", respectively.
Printed along the center of the center, moveable slide is an inverted logarithmic scale, "CI". Printed near the bottom of the bottom, fixed slide is a "K" scale, composed of three logarithmic scales (values 1 to 10) placed side by side.
The slide rule is stored in a white and blue cardboard box.
Printed along the bottom edge of the top, fixed slide and the top edge of the center, moveable slide are, respectively, "A" and "B" scales. These are composed of two logarithmic scales (values 1 to 10) placed side by side. Printed along the bottom edge of the center, moveable slide and the top edge of the bottom, fixed slide are logarithmic scales carrying values from 1 to 10 and labeled "C" and "D", respectively.
Printed along the center of the center, moveable slide is an inverted logarithmic scale, "CI". Printed near the bottom of the bottom, fixed slide is a "K" scale, composed of three logarithmic scales (values 1 to 10) placed side by side.
The slide rule is stored in a white and blue cardboard box.
Signedface of box, bottom right: ENGINEERING INSTRUMENTS, Inc. / PERU, INDIANA
Inscribedface, top slide, top center: DRAFT-A-PLAN BY LAKESIDE;
box face, top right: Students / "LEARNER" / SLIDE RULE / with instructions;
box face, bottom right: MADE IN U.S.A.
box face, top right: Students / "LEARNER" / SLIDE RULE / with instructions;
box face, bottom right: MADE IN U.S.A.
FunctionAccording to an owner, this slide rule was included in the Draft-a-Plan beginner's drafting kit. See this website for details.
For solving mathematics problems containing combinations of three factors, as well as problems involving squares, square roots, cubes, cube roots, and higher powers and roots.
For solving mathematics problems containing combinations of three factors, as well as problems involving squares, square roots, cubes, cube roots, and higher powers and roots.