5.25 in HIGH x 16.5 in WIDE x 20.25 in DEEP
(13.33 cm HIGH x 41.91 cm WIDE x 51.43 cm DEEP)
Gift of John Howell Books

"The Famous Voyage of Sir Francis Drake" Great Hall, June 17 - Sept. 8, 1979

Survey instrument. Description: polished brass instrument designated a Gradientor by George Davidson, with mounts, prisms of lenses. In wooden case, penciled: "George Davidson, 1886" in bottom of case. Instrument known today as a gradometer for the measurement of grades of slopes, marked #3. Remarks: George Davidson Collection from John Howell Books.

Used: George Davidson | Gradientor

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