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.]()
EncyclopediaWilliam Dunbar
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Virginia Society for the Promotion of Useful Knowledge
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William Tatham
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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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System 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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Steam
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![White Spherical Sundial Reproduction]()
EncyclopediaSpherical Sundial
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Species Extinction
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![Jefferson's handwritten notes and sketches for installing Rumford fireplaces at Monticello.]()
EncyclopediaSir Benjamin Thompson, Count von Rumford
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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]()
EncyclopediaSamuel Mitchill
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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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Pyramid 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
