Show overcomes illegibility acting on oil requests to decipher il 11 legibly documents and papers particularly asir ticul arly those have packed through rough li fire without being bui burned ned to t aslies ashes the bureau of standards hus has worked ar k ed out a method that Is s very and comparatively simple it la Is based anred on the principle that a pho plate or film besides being sensitive to light Is in also sensitive to certain gases or vapors the specimen eimen under investigation Is placed bet apte lieen n two photographic plates platea and kept in intimate contact with the sensitized mating in the dark for a pent ol ol of two weeks meeks in the case of tat fast on development in the usual manner a perfect copy of tile the writing und and tr inting Is obtained popular mechanics mechanic magazine Ung azilie |