Slide Rule

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. On the vexed question of fixing the position of the decimal point, the author feels that it is not possible, or at any rate, not desirable, to dogmatise. In this matter the personal factor has to be reckoned with, and while most practised users experience no difficulty in estimating the magnitude of the result by inspection or rough calculation, others find rules of considerable assistance. Both methods have been discussed so that the reader will be able to follow his own inclination in the matter.