Radiometer

Radiometer

Item #: 070240
Availability: Usually ships in 2-3 business days
Regular price: $59.00
Sale price: $29.99
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Fascinating and beautiful, the radiometer or light mill consists of a blown-glass bulb with a partial vacuum. Four vanes mounted on a spindle spin when exposed to warm light, the speed increasing with the intensity of the light. 8 1/2"h x 3" dia. Made in Germany.

Thomas Jefferson inherited from his father a collection of surveying and scientific instruments. Little is known about this collection, which most probably was destroyed in the Shadwell fire of 1770. Jefferson later acquired a collection of “Mathematical Apparatus” which was one of the finest in the country. He purchased many of these instruments, which included telescopes, microscopes, thermometers, and globes, on his journey to London in the spring of 1786.

Jefferson particularly loved instruments useful in “Physicomathematics”—subjects like astronomy and optics that required mathematical calculation. He wrote in 1816, “We cannot know the relative position of two places on the earth, but by interrogating the sun, moon and stars.” Jefferson valued astronomy because it furthered his knowledge of the earth and of his country’s geography. With his telescopes and his theodolite—an instrument equipped with telescopes and used for measuring both horizontal and vertical angles—Jefferson observed solar eclipses, fixed the true meridian of Monticello, and calculated the positions of features in the surrounding landscape. Jefferson also owned a hand magnifier, which he used to observe botanical specimens and insects.

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Gift Wrap Information
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We will wrap your gift in our silver gift paper, trimmed with a red ribbon and bow, and include a hand written gift message. The charge is $6.95 per item.

Each item will be wrapped and charged individually. You cannot elect to have multiple quantities wrapped together when ordering through our website. If you wish to do so, please call us at 1-800-243-1743 to place your order.

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