Sujet

Pendulum-Room at the Bottom of the Harton Coal-Pit, 1854. Creator: Unknown.

Légende

Pendulum-Room at the Bottom of the Harton Coal-Pit, 1854. Experiment to determine the weight of the Earth. 'The apparatus consists of two astronomical clocks with compensation pendulums, two invariable pendulums (Kater's) suspended...immediately in front of the clock pendulums. An astronomical clock, and an invariable pendulum were placed at each station with barometer and thermometer attached, which were regularly observed, so that the necessary corrections might be made for atmospheric resistance, variations of temperature, &c. There was also at each station a galvanic-signal-needle...connected by...insulated wires, placing the observers in electric communication. The upper and lower stations...were exactly in a vertical line, and distant nearly a quarter of a mile; and at each station the instruments were carefully enclosed to prevent the vibrations of the pendulums being affected by currents of air'. From "Illustrated London News", 1854.

Crédit

Photo12/Heritage Images/The Print Collector

Notre référence

HRM22B08_236

Model release

NA

Property release

NA

Licence

Droits gérés

Format disponible

14,3Mo (1,3Mo) / 20,7cm x 17,3cm / 2442 x 2041 (300dpi)

Mots clés

event time industry manufacturing science trade astronomy British equipment weight clock industrial experiment century Britain newspapers press astronomical clock gravity concept physics B&W timepiece coal mine vibration coal mining industrial revolution Coal Industry 19th century black & white black and white B W nineteenth century The Print Collector colliery Illustrated London News ILN newspaper engraving Unknown coalmine Sir George Biddell Airy Airy George Biddell Sir George Biddell George Biddell Airy 19th-century