Image: Mercury pendulum
Size of this preview: 198 × 599 pixels. Other resolution: 280 × 847 pixels.
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Description: Drawing of a mercury pendulum used in precision regulator clocks, from a French physics book from 1878. The two glass flasks are filled with mercury which expands with an increase in temperature, compensating for the increase in length of the pendulum due to thermal expansion of the rod, keeping the period of swing constant. About 10 inches (25 cm) long, this type was used in a style of mantle clock called a 'crystal regulator'. Alterations to image: Removed caption, rotated to compensate for scanning error, converted from JPG to PNG.
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