Interstate druggist Volume 1, no. 9

 
9781130120660: Interstate druggist Volume 1, no. 9

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 Excerpt: ...the English government did not legalize it until 1824. Ten years afterward, when the House of Parliament in London was destroyed by fire, the standard yard was lost, and England was again without a standard yard of length. Sheepshanks next made a standard yard measure, which the English government adopted, and, so that it could not be again destroyed by fire, four authorized copies were made of it. One of these was deposited in the royal mint, another in the Royal Society, another in the observatory at Greenwich, and the fourth was imbedded in the walls of the new House of Parliament. The standard yard measures which are owned by the government are copies of the original, one of which is owned by the Coast Survey. The United States Naval Observatory has one also. The delicacy of its construction may be gathered by the fact that a change of temperature of one hundredth of a degree Fahrenheit has been found to produce a sensible effect on the length of the bar. "The copies of the standard are made of bronze, for the reason that bronze is less affected by the temperature than any other distinct or single metal. Standard inch measures are to be found in many places. They are so nicely made that they indicate one ten-thousandth part of an inch. There is a machine in existence which measures a millionth part of an inch. The change of temperatnre caused by simply touching any part of it by the hand sensibly affects it. The standard yard measures are never used as a matter of fact, but they are kept simply because they are the standard, because for all practical purposes the standard inch can be and is used. Though there are no serious consequences arising from it, and never can be, a mere comparison of the various yardsticks and foot rules in general use will...

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