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Microbalance used during 1953 Mount everest expedition

Microbalance used during 1953 Mount everest expedition

1952-3
Control / readout unit for micro-balance

Control / readout unit for micro-balance

circa 1980
Perkin-Elmer AD-2Z second generation electronic micro-balance. Commercially very successful but has an auto-zero feature which was unpopular. Range 0-1gm.

Perkin-Elmer AD-2Z second generation electronic micro-balance

circa 1990
Perkin-Elmer AD-1 first electronic micro-balance with closed servo-loop. Range 0-1gm.

Perkin-Elmer AD-1 first electronic micro-balance, with closed servo-loop. Range 0-1gm.

circa 1980
Balance unit, serial no. 83911, with a cream metal case.

Balance unit

circa 1990
Balance unit, serial no 55920, with black and cream metal case.

Balance unit, first electronic micro-balance

circa 1980
Control / readout unit, serial no. 83910 with a cream and grey metal and plastic case.

Control / readout unit

circa 1990