The Australian War Memorial Collection. Test site
THESE PRISMS HAVE ALL BEEN MADE FROM THIS FUSED GLASS, AND ARE IN USE IN INSTRUMENTS DESIGNED AT THE UNIVERSITY. (NEGATIVE BY E.L. CRANSTONE).
WHEN THE GLASS HAS FUSED INTO A SOLID MASS IT IS SLOWLY COOLED. IT IS NOW TESTED FOR THE ABSENCE OF STRAIN. HAVING PASSED THE RIGID TEST IT CAN NOW BE MADE INTO LENSES OR PRISMS. (NEGATIVE BY E.L. CRA
MOST INSTRUMENTS CONTAIN GRATICULES. THESE ARE OPTICAL GLASS DISCS ETCHED WITH A SCALE. PROFESSOR AGAR, PROFESSOR OF ZOOLOGY USES A PANTOGRAPH DESIGNED AT THE NATURAL PHILOSOPHY LABORATORY FOR THE PRO
THIS OPTICAL FLAT WHICH HAS BEEN MADE TO AN ACCURACY OF ONE MILLIONTH OF AN INCH IS USED TO TEST THE SURFACES OF PRISMS AND LENSES. (NEGATIVE BY E.L. CRANSTONE).
MR. J.D. HOPPER, UNIVERSITY LECTURER, IN CHARGE OF THIS WORK IS SHOWN HERE CONTROLLING A POTENTIOMETER. (NEGATIVE BY E.L. CRANSTONE).
THE MIRRORS PRODUCED IN THIS WAY ARE USED IN STEREOSCOPES FOR THE EXAMINATION OF SERIAL PHOTOGRAPHS. THE INSTRUMENT SHOWN HERE WAS DESIGNED BY MR. F.J. CALDWELL. (NEGATIVE BY E.L. CRANSTONE).
GLASS SQUARES MUST FIRST BE MADE SCRUPULOUSLY CLEAN IN CHEMICAL BATHS. MR. A.G. GOODWIN (RIGHT) AND HIS ASSISTANT PETER LAW PERFORM THIS OPERATION IN THEIR LABORATORY. (NEGATIVE BY E.L. CRANSTONE).
