Preface.. CONTENTS Page II III 1 Fundamental considerations associated with the enforcement of specifications, tolerances, and regulations: 1. Uniformity of requirements___ 2. Tolerances for commercial equipment. 4. Inspection of commercial equipment....... 5. Correction of commercial equipment. 6. Rejection of commercial equipment.. Specifications applicable to all classes of scales – – Additional specifications applicable only to computing Additional specifications applicable only to retail devices.- 92d Specifications applicable both to vehicle tanks used as meas- ures and to vehicle tanks equipped with meters... Additional specifications applicable only to vehicle tanks 92f Specifications applicable to both taximeters and odometers. 139 VI SPECIFICATIONS, TOLERANCES, AND REGULATIONS FOR COMMERCIAL WEIGHING AND AS ADOPTED BY THE NATIONAL CONFERENCE ON WEIGHTS AND RECOMMENDED BY THE NATIONAL BUREAU OF STANDARDS FOR INTRODUCTION SOURCE. The specifications, tolerances, and regulations published herein comprise, in their latest form, all of the current codes as adopted by the National Conference on Weights and Measures, the latest action reported having been taken by the Fortieth National Conference on Weights and Measures in 1955. The Conference Committee on Specifications and Tolerances,' acting at the request of the The National Conference on Weights and Measures is a body made up of State and local weights and measures officials from all parts of the United States, which normally meets annually at the National Bureau of Standards, Washington, D. C. For a more detailed description of the Conference and its activities, see chapter 12, National Bureau of Standards Handbook 26, Weights and Measures Administration; this publication is out of print, but copies may be consulted in many Government Depository Libraries throughout the country and in State and local weights and measures offices. 2 A standing committee of the National Conference, consisting of five members. Communications to this committee may be addressed as follows: Executive Secretary, National Conference on Weights and Measures, National Bureau of Standards, Washington 25, D.C. 1 Conference or upon its own initiative, prepares from time to time, with the cooperation of the National Bureau of Standards, proposed amendments or additions to the material previously adopted by the Conference; such amendments or additions are then presented to the Conference as a whole, where they are discussed by weights and measures officials and representatives of interested manufacturers and industries; eventually the proposals of the Committee, which may have been amended on the floor, are voted upon by the weights and measures officials, a majority vote being required for adoption. It is the practice to adopt new codes tentatively, final action being deferred at least until the succeeding Conference; sometimes a code will retain its tentative status for a longer period. Major changes in existing codes are sometimes handled as in the case of new codes; at other times an important change in an existing code is regularly adopted but a future date is specified before which the change shall not be put into effect. Not infrequently the effective date for a major change in requirements-and sometimes for a new code has been specified as a month or more subsequent to the dates for the succeeding meeting of the Conference in order to provide the opportunity for review and modification of the requirements and for changing the effective date. All of the specifications, tolerances, and regulations given herein are recommended by the National Bureau of Standards for official promulgation in and use by the several States in exercising their control of commercial weighing and measuring apparatus; a similar recommendation is made with respect to the local jurisdictions within a State, in the absence of the promulgation of specifications, tolerances, and regulations by a State agency. PURPOSE. The purpose of specifications and tolerances is to eliminate from use, without prejudice to apparatus that conforms as closely as practicable to the official standards, weights and measures and weighing and measuring devices that are false, that are of such construction that they are faulty-that is, that are not reasonably permanent in their adjustment or will not repeat their indications correctly-or that facilitate the perpetration of fraud. CLASSIFICATION OF SPECIFICATIONS. The classification into "retroactive" and "nonretroactive" requirements is made in order that the requirements may be put into force and effect without unnecessary hardship and without whole |