Excerpt from Universal Wiring Computer
In submitting to the public the accompanying new system for determining the size of leads without calculations, the author desires to say that he has endeavored to make the charts as simple and practical as possible; but, as in other new departures, it is possible that such proportions as the dimensions of the scales, their ranges, the size of the charts, the limit of accuracy, etc., might be more advantageously chosen so as to bring the average values to the best parts of the charts. As the values for the usual determinations have such very wide limits, it is difficult to determine on the best proportions of the charts except by long and repeated use in practice under widely differing circumstances. Since this can best be done by the aid of those using this system under different circumstances, the author appeals to those using these charts to aid him in finding the most convenient proportions, by suggesting to him any changes in the present proportions gained from actual experience with the charts. Such changes will, if practicable, be embodied and duly acknowledged in subsequent editions, of which copies will be sent to those to whose kindness the author owes the changes.
As its title indicates, this book is intended to facilitate the computing of the size and quantity of wire used for wiring; it is not a treatise on wiring, but assumes a knowledge of wiring on the part of the reader. It is intended for a book of reference, and not for a book of instruction. The auxiliary tables, which were almost all calculated for this book, are limited to those which wiremen frequently have occasion to refer to.
The author is indebted to his friend Richard W. Davids for some practical suggestions, and to the Electrical Engineer for the use of some of the illustrations.
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