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Silicon crystal for wireless telegraphy, mounted in a locket, 1906-1916

Silicon crystal for wireless telegraphy, mounted in a locket, 1906-1916

1906-1916
Experimental BT crystal of 6378 kHz

Experimental BT crystal of 6378 kHz

Experimental BT crystal of 6369 kHz

Experimental BT crystal of 6369 kHz

BT crystal 5 Mhz standard

BT crystal 5 Mhz standard

Crystal from Dark Slides

Crystal from Dark Slides

1885-1895
Multiple assembly of 5 crystals near 11.5 Mhz

Multiple assembly of 5 crystals near 11.5 Mhz

Experimental crystal multiple assembly

Experimental crystal multiple assembly

Small tin containing crystal for Cosmos crystal receiver, made by the Metropolitan-Vickers Electrical Company, Trafford, Manchester, England, 1920-1930

Crystal for Cosmos crystal receiver, 1920-1930

1920-1930
spectroscope stand and calcite crystal, said to have belonged to William Lawrence Bragg.

spectroscope stand and calcite crystal

Residual portion of spinel crystal (magnesium aluminate) drawn from seed (each pull from seed would cost around £4000). c.1950

spinel crystal

circa 1950
Wireless Crystals (Neutron).

Wireless Crystals

Crystal for simple Gamma-ray computer

Crystal for gamma-ray computer

Calcite crystal, cork-mounted in wood frame, by C.D. Ahrens

Calcite crystal, by C.D. Ahrens

Calcite crystal with rhomb faces

Calcite crystal with rhomb faces

Biquartz crystal in brass and fibre ring

Biquartz crystal in brass and fibre ring