Roget (Peter Mark) Description Of A New Instrument For Performing Mechanically The Involution And Evolution Of Numbers, 1815.

Roget (Peter Mark) Description Of A New Instrument For Performing Mechanically The Involution And Evolution Of Numbers, extract from "Philosophical Transactions of the Royal Society of London", vol. 105, pp.9-28, 3 engraved plates (2 folding, 1 trimmed at outer margin), disbound, [Tomash & Williams R104], 4to, [1815].

⁂ "It was Roget who invented the concept of the log-log scale that was later universally adopted as one of the standard scales on a slide rule. Its value was not immediately appreciated because the need for this scale only became apparent when various formulae, containing non-integer exponents in thermodynamics were developed. Roget's scale was forgotten, and various unwieldy schemes were proposed for handling the until Roget's scale was rediscovered in 1901." - Tomash & Williams.