Directions for using the improved achromatic telescope

Directions for using the improved achromatic telescope

Usage conditions apply
First page of the “Directions” for using the improved achromatic telescope made by W. & S. Jones of London. Andrew Ellicott (1754-1820), American surveyor and geodesist, used a telescope of this sort to observe the moons of Jupiter, to determine longitude on earth. That telescope is now in the Museum collections.
Currently not on view
Object Name
book page
overall: 5 in x 7 1/2 in; 12.7 cm x 19.05 cm
overall with backing: 7 13/16 in x 5 5/16 in x 1/2 in; 19.84375 cm x 13.49375 cm x 1.27 cm
ID Number
accession number
catalog number
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Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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