Society of Glass Technology · [Sheffield] · leaf 549
ns: Fig. 104. simultaneously. Two lens blanks (Fig 104) are mounted with theiredges together and the countersink is ground in them simultaneouslyas shown diagrammatically. The lens of higher refractive indexis then secured to the two blanks and split along the line IV—IV.The two blanks are then… … III.—Lamp-worked and General Scientific Apparatus. 212. Apparatus for the Detec-tion of Ozone in Air. HeinrichGuthmann (Erlanger Ber., 1920,50/51, 219; from Zeitsch. Beutsch.Ges.fiir Meek, und Optik, 1920, Parts19 and 20, 117).—Suction applied bymeans of a water pump at A drawsin the gas under…
Glass
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