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Whirling Psychrometer, 1950-1953

1950-1953

Induction coil

1920

Bottle of Benzopurpurin

Dean Stark trap

Glass Sikes' Hydrometer (c. 1830) by J GRIFFIN & CO.

1830

Four Baume hydrometers in wooden box with thermometer

Demonstration astatic galvanometer by J. J. Griffin & Sons Ltd

1898-1907

Porcelain Bunsen burner, 1910-1913

1910-1913
Velox exposure meter, made by John J. Griffin and ons Ltd. Based at 20-26 Sardinia Street, London, WC. 5-step wedge with tissue paper steps - none, one, two, three, four, thicknesses, increasing paper thickness. Numbered 1 1/2, 3, 6 and 9. In card frame with printed instruction on the surround

Velox exposure meter

1894-1904
Schilowsky demonstration gyrostat mounted in gimbles on a stand with trolley and weight accessories to demonstrate the use of gyroscopes in balancing mono rail systems; made by Griffin & Sons.

Schilowsky demonstration gyrostat

1913