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Profs. Ayrton and Perry standard inductance

Profs. Ayrton and Perry standard inductance

Clark standard element (cell) no. 142

Clark standard element (cell) no. 142

1872
Clark standard cell

Clark standard cell

Clark standard cell no. 1297 by Nalder Brothers and Co.

Clark standard cell no. 1297 by Nalder Brothers and Co.

Pair of Clark standard cells in one case

Pair of Clark standard cells in one case

Campbell variable mutual standard inductance no. L-13769

Campbell variable mutual standard inductance no. L-13769

Electrically maintained tuning fork, by Muirhead

Electrically maintained tuning fork, by Muirhead

Standard air capacitor

Standard air capacitor

Standard condenser no. 30510

Standard condenser no. 30510

1911
Pair of Clark standard cells in one case

Pair of Clark standard cells in one case

Standard resistor no. 4644

Standard resistor no. 4644

3 standards to support bed

3 standards to support bed

1/3 microfarad standard condenser

1/3 microfarad standard condenser

1892
Pair of turned wooden standards, English, 1880-1920

Pair of turned wooden standards

1880-1920
Red glass standard (solid in tube holder), metal and glass stand

Red glass standard

Two standards for the cross-rail, from a Robinson horizontal board cutting saw. Each standard has an elevating screw. One standard has a shaft and worm gear to provide feed motion

Two standards for the cross-rail, from a Robinson horizontal board cutting saw

3 standards to support overhead gear.

3 standards to support overhead gear.

Red glass standard, in holder, metal and opaque glass

Red glass standard