4 Tolles eyepieces
Date: 1860-1874
Inventory Number: 1045q
Classification: Microscope Ocular
Maker: Robert B. Tolles (1823 - 1883)
Maker: Boston Optical Works (fl. 1867 - 1895)
Maker: Charles X. Dalton (1840 - 1912)
User: Department of Geology and Geography, Harvard University (1890 - 1961)
Cultural Region:
Dimensions:
eyepiece 1: 4.1 x 4.2 x 4.2 cm (1 5/8 x 1 5/8 x 1 5/8 in.)
eyepiece 2: 4.9 x 4.3 x 4.3 cm (1 15/16 x 1 11/16 x 1 11/16 in.)
eyepiece 3: 7.4 x 4.3 x 4.3 cm (2 15/16 x 1 11/16 x 1 11/16 in.)
eyepiece 4: 5.1 x 3.2 x 3.2 cm (2 x 1 1/4 x 1 1/4 in.)
Description:
1045q-- 4 Tolles eyepieces, one incomplete
(1) solid eyepiece with two lenses. Dust cap with nickel plating over the top lens.
(2) solid eyepiece with two lenses. Dust cap over the top lens. Top lens collar lightly scratched "3 / 4." This lens does not screw in fully. Label says that it came from the Geology Department.
(3) eyepiece with two lenses. Protective sleeve over top lens. Large aperture. Most of barrel is empty, as if intended for use with a larger solid element.
(4) Part of solid eyepiece, being the sleeve with flange. No top lens or lower lens. Screw collar at the bottom.
(1) solid eyepiece with two lenses. Dust cap with nickel plating over the top lens.
(2) solid eyepiece with two lenses. Dust cap over the top lens. Top lens collar lightly scratched "3 / 4." This lens does not screw in fully. Label says that it came from the Geology Department.
(3) eyepiece with two lenses. Protective sleeve over top lens. Large aperture. Most of barrel is empty, as if intended for use with a larger solid element.
(4) Part of solid eyepiece, being the sleeve with flange. No top lens or lower lens. Screw collar at the bottom.
In Collection(s)
Signedunsigned
Curatorial RemarksSee the file for 1045 for more details on the types of optical elements, their dates, and how they performed under tests by Ebenezer Gay.