OCR Text |
Show . Scales are now made of such nice adjustment ad-justment that they will weigh the small-. small-. est hair plucked from the eyebrow. They are triumphs of mechanism, and are inclosed in-closed in glass cases, as the slightest . breath of air would Impair their records. . The glass case has a sliding door, and as soon as the weight Is placed In the balance bal-ance the door slides down. The balances are cleared and made ready for further use by presing a button, but-ton, which slightly raises the beam. Two THeces on the scales," and an autograph -Written In pencil on either piece will cause the other side to ascend, and the needle, which indicate the division of the weight even to the millionth part of a pound or less, will move from Its perpendicular. A signature containing nine letters has been weighed and proved to be exactly two ml!"'"-flmmes or one fifteenth thou-- thou-- MI five uundredth part of an ounce troy. |