National Museum of American History
Spy Glass
Jesse Ramsden · 1775-1800
Small refracting telescope with an achromatic objective 1¼ inches aperture. There are two brass tubes. The inner one is engraved “Ramsden / London” and calibrated from one to four. A dial adjusts the eyepiece. The telescope is housed in a cylindrical cardboard container covered in shagreen.
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