Antique WILLIAM LADD Fusee Chain-Drive Presentation Lacquered Brass MICROSCOPE

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Antique WILLIAM LADD Fusee Chain-Drive Presentation Lacquered Brass MICROSCOPE
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Description
Here we have a rare and fine English presentation microscope, with a fusee chain-drive focusing mechanism. This design was patented and pioneered by William Ladd of Walworth, London, England. While it is unmarked aside from the presentation inscription, it is marked with his patent. Circa 1851-1855.
The inscription on the microscope reads: "To B.P. Davidson, Esqr. From the Members of the Armagh Natural History Society In Token of Their Sense of His Valuable Exertions for that Institution." The bar limb is marked "Chain Adjustment REGISTERED May 18th 1851."
This microscope was originally purchased by the estate owner in 1975, and the original sales description includes the following:
"Bright brass, original lacquer finish, 14" h (min) extending to 16 1/2", chain drive coarse focus and nose piece fine focus screw, two axis driven mechanical stage 2 1/2" sq with rotating aperture disc and 2" dual mirror below. The stand is derived from Ross with the bar limb supporting the 7 3/4" long microscope tube. Included are 2 oculars, objective with triple button lenses (achromatic?), live box, paired Nicol prisms, stage forceps, stage condenser, and fitting and lens for conversion to a simple microscope. Original dovetailed mahogany case 7 1/2" x 6" x 10 3/4" h. Case in very good, microscope in very fine condition.
Although unsigned, this is an example of the early work of William Ladd who seems to have been the first instrument maker to use a chronometer fusee chain to control the large scale focusing motions of a microscope...The R.M.S. in their catalog describing the Ladd microscope in their collection notes, "Motion is imparted to the body not by rackwork but by a chain coiling round a spindle controlled by a milled head, giving a remarkable smoothness of motion and freedom from backlash." In his later work, Ladd developed unique structures too, but here he has worked with a standard design giving further evidence that this is an early instrument produced to establish a priority for his chain drive."
10547-178
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*Welcome! and a big thank you for shopping with Gary Germer & Associates, we appreciate you stopping by. Gary is one of Portland, Oregon's most respected antique & personal property appraisers & estate brokers. ISA certified and in the business for nearly 30 years, Gary has worked hard to build a name that is synonymous with integrity, honesty & good humor. We strive to only improve this reputation.
Please expect prompt, friendly service. Authenticity of all items is guaranteed. We guarantee our items to be packed with care and arrive as described or your money back. Please contact us with any questions or concerns, we are happy to help.
We typically expect payment within 24 hours of purchase, please contact us if you need a little more time, we are happy to accommodate within reason.
In Portland, Oregon? Come visit us at our gallery, we'd love to meet you!
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