OCR Text |
Show THINGS SCIENTIFIC . The genuine ruby Is the pure crystalline crystal-line variety of corundum. Emery, the abrasive, is an Impure form of corundum. An electrically driven machine stamps and seals letters. The letters are fed ln at the left and deposited ln the receiving rack. A newly patented camera Indicates the number of exposures made by means of a dial Instead of the nsual red window ln the back. Pneumatic linings for automobile cushions have been Invented that can be Inflated to take the place ot springs and padded upholstery. Small enough to be carried ln a vest pocket, a new check protector perforates figures In checks and tills the perforations with colored Ink. A new headlight dimming switch for automobiles Is operated by a driver's foot so that he does not have to remove a hand from the steering wheel. Scientists at Yale university are perfecting an inhaiator which Is expected ex-pected to reduce the death rate from carbon monoxide, electric shock and drowning. |