vey. Many of these are now of the countries concerned. A large number of learned purely historical interest, the more recent ones only men were employed to study the methods to carry out being accepted as absolute standards. The letter accompany- practically the theoretical requirements of the… … different keys being re- standards of measure- quired to open the vault. ment. It was procured The Keys are in charge of for Mr. F. R. Hassler by M. three separate individuals. The American national J. G. Tralles, early in the present century. M. Tralles It has had a nuinber of comparisons. [In…
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