Australian War Memorial Negative No. 5921 Date: 26 February 1941. Shown here: C.W. Allen cutting a lens blank from optical glass with a brass cutter. Location: Commonwealth Solar Observatory, Mt Stromlo. Negative by E.L. Cranstone.
Date: 26 February 1941.
Shown here: C.W. Allen cutting a lens blank from optical glass with a brass cutter.
Location: Commonwealth Solar Observatory, Mt Stromlo.
Negative by E.L. Cranstone.
