|Slide rules HOME page||COLLECTION||10" RULES||U.S.A.|
|Model||905-ES, Texas Speed Rule|
1. Every year until about 1980 a slide rule competition was held in the State of Texas (US). The contestants had to complete a series of calculations in 30 minutes. As the competition was timed there was a premium on speed but the marking system also required high accuracy. If the answer was accurate to three place of decimals, three points were awarded but if the answer was off by more than 2 places in the third significant figure no marks were awarded. Whilst other rules were allowed, and were used, the Pickett "Texas speed rule" was most popular.
3. The one sample test paper I have seen had 75 questions. It started with easy ones but got more and more difficult. I give below three samples:
4. This rule is in Pickett's "eye-saver" yellow.
|Detail - front left
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|Detail - back left
||Detail - back centre
|Manufacturing date||c 1960|