Compound Microscope, J. Cuff Reproduction, c. 1757

Compound Microscope, J. Cuff Reproduction, c. 1757

This important design was devised by John Cuff, in 1744 at the suggestion of Henry Baker the well-known 18th century microscopist. The most significant innovation is in the composite side pillar, which gives rigidity, enabling the instrument to be provided with a delicate fine focus.

This instrument was reproduced from the original antique microscope in the McCormick Collection.

STAND: The instrument foot, a 6 3/8" square box with accessory drawer, is made of oak, veneered with mahogany. The base pedestal, a composite brass pillar 9 7/8" tall, has a body mounting arm, 3 1/8" long, with a ring at the end. STAGE/SUBSTAGE: The fixed stage of a Maltese cross shape, has a 1 1/4" central recessed aperture, plus two stage openings, and two substage clips for accessories. A 1 3/4" single concave mirror is set in the optical axis. BODY: The 4" tall body, with 2 1/2" long nosepiece, has three ornamental ridges. The eyepiece has a sliding dust cap. OCULAR: The ocular is a biconvex doublet eye lens of 11/16" diameter and a second 1 1/4" diameter lens located near the middle ridge. The biconvex field lens is also 1 1/4". OBJECTIVES: There are six objectives in brass mounts. ADJUSTMENT: Coarse adjustment is made by a sliding motion of the composite pillar. A long fine thread screw connecting the sliding block with the body mount arm gives fine adjustment. ACCESSORIES: Accessories are a Bonanni stage, light cone, black and white ivory disc, 3 glass plates, Lieberkuhn sleeve and reflector, stage forceps, bull's eye condenser, live box, ebony mounted flea glass, fish plate, tweezers, 8 ivory talc boxes and a cleaning wire. CASE: The mahogany case (16 3/4" tall) with bottom drawer has a trade card in the back giving Cuff's address after 1757. TOTAL HEIGHT: The box foot base and closed instrument are 13" tall. SIGNATURE/ENGRAVING: Numbers 1 through 6 are engraved on the objectives and along the right hand side of the front pillar. Circling the central stage aperture is the inscription "J CUFF Londini Invt. & Fecit." The Replica Rara stamp and serial number appear on the pillar back.

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