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Guard's chronometer, Birmingham & Derby Junction Railway

Railway Timepieces

1834-1844

Six-stage half-hour sand-glass

Time Measurement

1600-1630

Battery-driven Quartz Clock by Smiths, British, 1980-85

Public Health & Hygiene

1971-1979
Atmospheric clock, Mercury, unsigned, 1850-1900. The time is shown by a bead of mercury falling down a sealed plugged glass tube under gravity. The use of mercury in timekeeping has several different patents.

Mercury Atmospheric Clock, 1850-1900

Time Measurement

1850-1900