Directions for using the improved achromatic telescope


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.

Location: Currently not on view

See more items in: Medicine and Science: Physical Sciences


Exhibition Location:

Data Source: National Museum of American History

Id Number: PH.310346.01Accession Number: 116914Catalog Number: 310346.01

Object Name: book page

Measurements: overall: 5 in x 7 1/2 in; 12.7 cm x 19.05 cmoverall 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


Record Id: nmah_1764563

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.