| 摘要 |
822,909. Graticules. COMMONWEALTH OF AUSTRALIA. Feb. 22, 1956 [Feb. 25, 1955], No. 5554/56. Class 97(1) [Also in Group XXIII] A graticule is formed by depositing the pattern in metal, preferably silver or copper, or metal compound, preferably chloride or sulphate, on the surface of the glass, exposing the pattern to heat, preferably 200‹-500‹C. and simultaneously to oxidizing conditions, either by making contacts between the anode and cathode of an electric circuit and the faces of the glass to be marked and applying an A.C. or D.C. potential preferably of 6-2000 volts for a period of 15 seconds to 30 minutes, or by exposing it to a mixture of air and sulphur trioxide or like chemical oxidizing agent, preferably for between 30 seconds and 20 minutes, to form within the glass a latent image of the pattern and then exposing the latent image to heat, preferably 400 ‹C. or 500‹C. for 15-20 minutes or 2 minutes respectively, and simultaneously to reducing conditions, such as hydrogen gas or bombardment by electrons or X-rays to produce a visible image. |
