Artifact Details

Title

Log log duplex slide rule

Catalog Number

X360.84A

Type

Physical object

Description

K&E slide rule with scales, each with engraved markings. All manufactured markings are clear. The body is the original ivory color with no discernable staining, fading or blemishes on the scale. The top and bottom scales are fixed in place; the center scale slides right or left to perform a calculation. There is a clear plastic window with a center line that is used to read out the result of the calculation. Markings are located on both sides of the slide rule for different types of calculations.

The center scale slides right and left freely if the slide rule is held by the metal end fastener. If the slide rule is held in the middle, squeezing the top and bottom scale, the center slide is locked in place and will not move. This function was designed to prevent losing the result of a calculation by accidently moving the slide.

Date

1932

Manufacturer

Keuffel & Esser Company

Place Manufactured

U.S.

Identifying Numbers

Serial number 569369

Dimensions

overall: 1 in x 13 1/2 in x 2 1/4 in

Category

Pre-computer/slide rule

Credit

Gift of Joseph Santangelo

Lot Number

X360.84A-B
 

Related Records

X360.84B Log log duplex slide rule case