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When a number of thermometers are submitted for a test a “résumé sheet" is returned with the certificates. This sheet gives a statement of the number of thermometers that have received certificates, the reasons why others were rejected, etc. A sample résumé sheet corresponding to the test record sheet shown on the preceding page is shown in fig. 10.
RESULTS OF THE WORK.
It is gratifying to note a marked improvement in the quality of the thermometers now being submitted, especially in the product of those firms which bave freely availed themselves of the facilities of the Bureau. Not the least important result has been the introduction into the clinical-thermometer industry of a uniform scale of temperature. At the present time practically all the large manufacturers have sent their standards to the Bureau for comparisons, so that not only are the standards in accord with one another, but they are also in accord with the scale of temperature used throughout the scientific and technical world. An impartial and authoritative test is of value alike to the manufacturer, the dealer, and the user of thermometers. To the first mentioned it is a constant check on his standards and product, and to the dealer and user the certificate is a guarantee of the accuracy of the thermometer.
The allowable errors for certification have been made as liberal as is consistent with a good product and with due regard to the interests of all concerned. The present limits were fixed after extensive experiments made on clinical thermometers obtained from different sources, but as the standard of product increases it may be desirable to modify these limits.
The investigation of the methods described and testing on a small scale have been in progress for the past three years. The announcement, however, that the Bureau was prepared to test thermometers was made only about eight months ago. Since then about five thousand thermometers have been submitted for test, so that ample opportunity has been afforded to test both the apparatus and the methods.
On account of the desire among users of clinical thermometers to have instruments with zero corrections the demand on the manufacturer has been unreasonably severe. As a matter of fact, a thermometer having corrections of 0°.1 F. is practically as good as one with zero correction, since this order of accuracy is all that is essential. A thermometer with corrections as high as 00.2 F. may ordinarily be
Department of Commerce and Labor
BUREAU OF STANDARDS
RÉSUMÉ OF B. S. TEST NO. 938.
For thermometers that failed to pass the preliminary test, for reasons specified in the first four sections of this table, a rebate is allowed at the pro rata rate corresponding to the number of thermometers submitted for test.