The Australian War Memorial Collection. Test site
ALL OPTICAL PRODUCTS ARE SUBJECTED TO RIGOROUS TESTS. MR. R.L. ABBEY USES A SPECTROMETER TO TEST A PRISM. (NEGATIVE BY E.L. CRANSTONE).
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
OPTICAL MUNITIONS PANEL - MELB. UNIVERSITY. J. DARBY AND W. LASICH TEST THE ANGULAR SCALE OF A DIAL SIGHT AGAINST A STANDARD DIVIDED CIRCLE. (NEGATIVE BY E.L. CRANSTONE).
MR. G.F. RICHARDSON (LEFT) AND K.L. DEAN MEASURING FOCAL LENGTH OF A LENS FOR AN OPTICAL INSTRUMENT. (NEGATIVE BY E.L. CRANSTONE).
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).
THE RESULTS OF THE TESTS ARE ANALYSED. PROFESSOR HARTUNG DISCUSSES THE GLASS WITH MR. AMPT BEFORE HIS ANALYSIS. (NEGATIVE BY E.L. CRANSTONE).
THE FINISHED OPTICAL GLASS. (NEGATIVE BY E.L. CRANSTONE).
