Four boxes containing gemstone micro-lens tools, sapphire roles and samples of Gadolinium gallium garnet (GGG), Yttrium aluminium garnet (YAG) and Cubic zirconia, with working notes. Part of a collection of optical instruments used by Horace Dall.
Kodak box containing gemstone micro-lens tools, with working notes on methods to measure deflection and dispersion of YAG material dated 1978. Part of a collection of optical instruments used by Horace Dall.
Plastic box containing gemstone micro-lens tools, unsigned. Part of a collection of optical instruments used by Horace Dall.
Plastic box containing two sapphire roles with working note, unsigned. Part of a collection of optical instruments used by Horace Dall.
Plastic box containing a mounted sample of Gadolinium gallium garnet (GGG); mounted sample of Yttrium aluminium garnet (YAG); unmounted sample of cubic zirconia in folded paper; unmounted sample of GGG; with working notes regarding YAG, cubic zirconia, and GGG. Part of a collection of optical instruments used by Horace Dall.
