Encyclopedia
Science & Exploration
Articles on Jefferson's lifelong interest in science, exploration, and technology written by Monticello researchers and scholars.
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![Cover a of a modern version of Jefferson's Garden Book, edited and annotated by Edwin M. Betts.]()
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EncyclopediaClocks and Timekeeping
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![Four numbered wooden disks laying on their sides next to 20 more disks threaded onto a brad spindle with each disk showing random letter etched around their circumference edges.]()
EncyclopediaWheel Cipher
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![Bust-length painting of William Dunbar.]()
William Dunbar
1749 - 1810
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![Brass theodolite composed of a brass telescope on a large turn gear over the horizontal compass and spirit level housing, with a second stationary telescope on a central pivot below the horizontal disk. The sighting apparatus can be adjusted with four levelling screws that holds it on the base. Rests on straight collapsible mahogany tripod legs with brass bands. The disk plate is engraved "Ramsden-London".]()
EncyclopediaVirginia Society for the Promotion of Useful Knowledge
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William Tatham
1752 - 1819
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![Jefferson's daily weather records for his time in Philadelphia during the week of July 1 - July 8.]()
EncyclopediaThermometers
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![Map of the western half of North America with a single ridge marking the Rocky Mountains and almost no detail beyond to the Pacific coast.]()
EncyclopediaWestern Exploration
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![Silhouette believed to be of Tahawarra of the Otoe-Missouri Tribe]()
EncyclopediaNative American Silhouettes
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![Satellite view of Mount Tambora and its dormant caldera.]()
EncyclopediaThe Eruption of Mount Tambora
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![An odometer set in a wooden box with a clock-like face with the Roman numerals I-XII and a single hand point a just past six.]()
EncyclopediaOdometer
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![Public Domain]()
EncyclopediaSystem of Nature
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![Brass instrument with a small telescope on top of a housing that can be adjusted up and down and side to side in a circle]()
EncyclopediaSurveying
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![Fry-Jefferson map of Virginia]()
EncyclopediaSurvey of the Coast
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EncyclopediaSurveying Compass
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![1890 Model by Samuel Pemberton/Public Domain]()
EncyclopediaSteam
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![White Spherical Sundial Reproduction]()
EncyclopediaSpherical Sundial
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![Several Mastodon bones, including an ulna (upper middle)]()
EncyclopediaSpecies Extinction
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![Jefferson's handwritten notes and sketches for installing Rumford fireplaces at Monticello.]()
Sir Benjamin Thompson, Count von Rumford
1753 - 1814
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![Engraving of Samuel Latham Mitchill, a middle-aged man with slighly wavy, possibly graying hair, hooded eyes, a roundish face, and a mild expression wearing a dark overcoat, light waistcoat, and cravat]()
Samuel Mitchill
1764 - 1831
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![Modern-day map of the course of the Red River along Texas and into Louisiana]()
EncyclopediaRed River Expedition
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EncyclopediaPyramid of Cheops (Model)
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![An image of the first page of Thomas Jefferson's January 18, 1803 letter to Congress proposing funding of what became the Lewis and Clark Expedition.]()
EncyclopediaPolitical Origins of the Lewis and Clark Expedition
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![One of the conical Peaks of Otter mountains in fall with a lake or pond in the foreground.]()
EncyclopediaPeaks of Otter
