Computation Unit No. 209
March 1958

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This is probably the second of at least three Computation Units. An earlier unit appeared in 1951 (unit 123), and another in 1963 (unit 273). The unit includes:

• linear and logarithmic scales on a paper sheet
• patterns for Napier's Rods
• a slide rule
• a 12-page booklet containing 30 experiments

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