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    By Charles Hoare
    London   Strahan & Co
    7.5" by 4.5" vi, [1], 2-104, 12, 32pp
    A fascinating and scarce Victorian era guide to the use of the slide-rule, a mechanical calculating instrument used primarily for multiplication, division, roots, logarithms, and trigonometry, based on logarithmic scales.
    By Charles Hoare

    1869 The Slide-Rule and How to Use It

    London   Strahan & Co
    7.5" by 4.5" vi, [1], 2-104, 12, 32pp
    A fascinating and scarce Victorian era guide to the use of the slide-rule, a mechanical calculating instrument used primarily for multiplication, division, roots, logarithms, and trigonometry, based on logarithmic scales.
    £150.00
    : 0.5kgs / : 964F45
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    Description

    Early Edition, Publishers' Original Binding, Scarce

    First published the year prior, this is an early edition of Charles Hoare's scarce guide to slide-rule use.

    With a slide rule inserted in a pocket to the front board, with only one of the four strings broken.

    Invented in the 17th century following John Napier’s development of logarithms, the slide-rule remained a standard tool for engineers and scientists until it was largely replaced by electronic calculators in the 1970s.

    With forty-four pages of advertisements to the rear, dated 1871.

    Condition

    In the publisher's original blind stamped cloth binding. Back strip age toned, with bumping to board perimeters. Head of front joint starting, with board firmly held. Slide rule inserted in pocket to front board, with one string on slide rule broken. Internally, firmly bound. Pages a touch age toned, with light handling marks.

    Good

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