Object Name: pocket botanical and universal microscope
Dimensions: 10.2 x 6.3 x 4.5 cm (4 x 2 1/2 x 1 3/4 in.)
case: 3.2 x 8.3 x 10.8 cm (1 1/4 x 3 1/4 x 4 1/4 in.)
Description: This simple microscope is a pocket botanical and universal microscope by George Adams with additions by William and Samuel Jones.
Three small magnifiers are set in brass rings on short arms on a larger ring attached to the top of a square bar that forms the post. A ring stage slides on the post with a fine adjustment screw and clamp also on the post. The post fits in a socket on the edge of an elliptical wood base. A hole in the base also provides a mounting for a mirror fork-mounted on a pin.
The stage has a ring clip below with coil springs to hold slides. The lenses may be used singly or in combination.
With a black shagreen box (3&1/4 x 4&1/4 x 1&1.4 inches) with green plush lining.
Accessories: 3 magnifiers attached on arms; 1 Lieberkühn (lens missing); 1 high power lens; Insect box with 2 glass covers; stage forceps; 2 ivory slides; box.
Historical Attributes: This pocket botanical and universal microscope was acquired in 1789 by Dr. John Jeffries (Harvard AB 1763), a loyalist who fled to England during the American Revolution.
Dr. Ernst noted that "It has an attachment with a Lieberkühn's mirror for using a drop of water as a lens."
Curatorial Remarks: Dr. Lewis: "very close to RMS A-69 by W. and S. Jones. See: Hist. of the M. , Clay & Court , p. 71, 1975."
Provenance: Dr. John Jeffries, purchased in London, 1789; Jeffries family; gift of Dr. B. Jay Jeffries to Ernst Collection in 1900.
Published References: "Catalog of the Exhibition, Benjamin Franklin: A How-To Guide," Harvard Library Bulletin, 17 (spring-summer 2006): 96-97.