Standards of Length and Their Practical Application (Classic Reprint) - Couverture souple

Pratt Whitney Company

Couverture souple

ISBN 10 : 1330606639 ISBN 13 : 9781330606636

Editeur : Forgotten Books, 2019

Synopsis

The digital edition of all books may be viewed on our website before purchase. Excerpt from Standards of Length and Their Practical Application (Classic Reprint)



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A propos du livre

Présentation de l'éditeur

Co., Gentlemen:- I communicate herewith the results of my investigation of the units of length upon which your system of gauges depends. In the preliminary discussion of this question with you, certain considerations were urged by which we should be governed in the construction and adoption of standards of length for practical use in mechanical operations. In iny letter of May 26, 1880, these were enumerated as follows: First. For ,the yard as a standard unit, the material employed should be an alloy known as Baily smetal, composed of 16 parts of copper, 2J parts of tin, and 1part of zinc, since this is the composition of the Imperial Yard of Great Britain, to which final reference will be made, and of the standard yard, Bronze 11 of the United States Bureau of Weights and Measures. Second. The particular standard yard or yards constructed should be referred to one of the two yards named, and not to any copy in the hands of a private person. This standard of reference ought to be within easy access, in order that comparisons with it may be made at stated intervals for the purpose of ascertaining whether a constant relation between the two units is maintained. Since the latter consideration would prevent a direct reference to the Imperial Yard No. 1, I strongly urge the importance of referring the proposed standard yard, which you have empowered me to construct, directly to Bronze 11. This standard is not a legal standard in the sense that it has been authorized as such by an act of Congress, but since it has been in actual use for many years, and since it will, without doubt, receive a legal authorization in the near future, this objection has but little practical force.
(Typographical errors above are due to OCR software and don't occur in the book.)

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Détails de l'édition

• Éditeur: Forgotten Books
• Date d'édition: 2019
• Langue: anglais
• ISBN 10: 1330606639
• ISBN 13: 9781330606636
• Reliure: Broché
• Nombre de pages: 188
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