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FOREWORD ) 1961 This Handbook supersedes National Bureau of Standards Handbook 44, published in 1949, and presents a complete revision of the specifications, tolerances, and regulations for commercial weighing and measuring devices of the National Conference on Weights and Measures. This revision was developed by the Conference Committee on Specifications and Tolerances in cooperation with the Office of Weights and Measures of the Bureau, and was adopted by the 40th National Conference in 1955.

This Handbook was first issued in its present form in 1955, having been adopted by the 40th National Conference on Weights and Measures, following development of the material by the Conference Committee on Specifications and Tolerances in cooperation with the Office of Weights and Measures of the National Bureau of Standards. This 1962 printing is made up of the 1955 edition and all amendments adopted by the Conference through the 46th meeting in 1961.

The National Bureau of Standards has a statutory responsibility for "cooperation with the States in securing uniformity of weights and measures laws and methods of inspection." In fulfillment of part of this responsibility, the codes in this Handbook are recommended by the National Bureau of Standards for promulgation by the States.

Special mention for their efforts in the development of these codes of specifications, tolerances, and regulations for commercial weighing and measuring devices is due the following members of the National Conference on Weights and Measures, who have served on the Conference Committee on Specifications and Tolerances: J. E. Brenton of California, V. D. Campbell of Ohio, C. 0. Cottom of Michigan, A. H. Dittrich of New Hampshire, T. C. Harris, Jr., of Virginia, H. E. Howard of Miami, Florida, C. L. Jackson of Wisconsin, H. J. McDade of San Diego County, California, R. E. Meek of Indiana, R. W. Searles of Medina County, Ohio, D. M. Turnbull of Seattle, Washington, and R. Williams of Nassau County, New York; and W. S. Bussey, M. W. Jensen, and R. W. Smith of the staff of the National Bureau of Standards.

A. V. Astin, Director,
National Bureau of Standards.

II

IMPORTANT NOTICE FOR THE HOLDERS

OF THIS HANDBOOK

In order that your Handbook may be kept current and most useful, it is imperative that the following steps be taken:

1. Promptly fill in and mail the green postcard found just

before the title page. (This will assure your annual receipt—without charge of Replacement Sheets including code changes.)

2. Place the Handbook in a standard 3-ring binder—8 by

5 inches.

3. Immediately upon receipt of a set of Replacement Sheets,

insert the individual sheets and discard the replaced sheets.

4. Notify the Office of Weights and Measures, National

Bureau of Standards, Washington 25, D.C., of any address change.

5. If ownership of the Handbook is transferred, direct the

attention of the new owner to this list of instructions.

III

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