ds of the bureau were rectness of whose standards there is often no means of determining. loaned to manufacturers, others constructed according to its recommendations were sub- This has been changed since the establish- ment of the National Bureau of Standards mitted for test, while still others… … scope through the glass win- signed to record the highest Fig. 4.—Section of Comparison Tank. dow in the cylinder, while an temperature to which they electrically driven agitator have been exposed, is self- keeps the water in constant circulation. registering, with a lens front, so that the Such an…
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