When, by practice with logarithms, we become familiar with the correspondence between additions of length on the logarithmic scale (on a slide-rule) and multiplication of numbers in the natural scale (including fractional numbers), A /5 acquires a definite meaning as the number corresponding to the extremity of a length x, on the logarithmic scale, such that 5 corresponds to the extremity of 2X.
A slide rule should be used for the arithmetical operations, as it works to the accuracy obtainable in practice.
The rotating slide rule bezel is bi directional and and non ratchet.
The Chronomat is introduced in 1942 - the first chronograph to be fitted with a circular slide rule.
(SEE Logarithm.) The slide-rule (see Calculating Machines) is a simple apparatus for the mechanical application of the methods of logarithms.
It measures short times and is equipped with a "navigation computer," which is a circular slide rule that handles airborne navigation calculations such as climbing times and fuel consumption rates.
The model has also lent its name to a line of original mechanical chronographs, all of which are fitted with the Navitimer's slide rule.
Optional high-tech features include bi-directional pilot's slide rule bezels, solar technology, enhanced 100 lap memory, alarm chronographs, and average speed flight computers.
In terms of performance, it's hard to beat the circular slide-rule internal bezel, screw-down case back and 12 hour chrono functions.
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