The Why Files The Why Files --

Why-Mart:Making Scientists Smile. Always

leather case on top. White, numbered sliderule belowManually calculates!!

Antique slide rule
Item description: Slide rule with genuine wooden core, leather case.

Product features

Manually calculates squares, square roots, trig functions, other mathematical functions.

Supplied leather case.

Runs day and night; no batteries needed.

Order before Dec. 24 and receive free graphitic printer (shown).

Two-ended mechanical pencil with 'U.S. Government' stamped on side
Graphitic printer is yours for free!
Prints red or black "ink," needs no batteries

User reviews

7 of 8 readers found this comment useful [Editor comment: even if it is from a dead man!]:
"Made me long for the days when we designed atom bombs with these sticks!" - J. von Neumann

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Megan Anderson, project assistant; Terry Devitt, editor; S.V. Medaris, designer/illustrator; David Tenenbaum, feature writer; Amy Toburen, content development executive

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