ACU-MATH No. 511 - (3) (Yellow) Greg's Slide Rules
Front Left

Front Right

Back Left

Back Right

ACU-MATH No. 511 (3) - Notes

  1. This mannheim professional rule is almost identical to the earlier model Acu-Math 511 (1) in my collection. The main differences are:
    • The later model has metal end pieces on both sides.
    • The cursor has cross-hatching on the plastic ends to allow for better grip
    • Model information has moved from each side of the front to the top of the front above the S scale.
    • The old model has drilled cutouts in the plastic to allow for grip. This has been removed for the later model.
    • Trig instructions have been added to the back of the slide.
    • New model is 3 mm shorter and wider.
    • Cursor is complete on both sides.

  2. The Metal end piece on the left hand end of this rule and Acu-Math 511 (2) are both offset slightly, this corresponds with other examples I have seen.
  3. This rule has the Acu-Math symbol on the right side of the middle bar yet Acu-Math 511 (2) clearly does not.
  4. This rule is also coloured yellow.


Further details about this Slide Rule:

Model No. 511 - Mannheim Professional
Country of Manufacture USA
Scales Front S, K, A [B, CI, C] D, L, T
Scales Back Equivalents tables and Trig instructions
Number of Scales 9
Slide Rule Materials Metal core, plastic faces with metal end pieces. Metal core looks like magnesium
Cursor Materials Plastic
Cursor Lines 1 Front
Scale Length 25 cm
Length 31.4 cm
Width 4.2 cm
Condition Good.
Documentation None
Accessories Vinyl Case

Last updated: 2002-07-06 14:40 AEST
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