Books by Boardman, A
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£12.00
Introducing the Use of P I C Direct and inverse Log-Log Differential Scales for Finance Calculations.
30p stapled pamphlet, faint blue cover, frontispiece of Slide Rule, very good, = Booklet No 80
£12.00
£12.00
Introducing the Use of P I C Differential Scales for Trigonometrical Computations.
22p stapled pamphlet, folding plate for the P I C (Thornton) Slide Rule, very good, = Booklet No 81.
£12.00
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