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CHARLES X DALTON LARGE COMPOUND MICROSCOPE

C. 1886

SIGNED: C. X. DALTON 1886 (HIDDEN)

SERIAL NUMBER: NONE

MODEL: UNKNOWN

DESCRIPTION HISTORY

Tolles Microscope

tolles tolles tolles

DESCRIPTION:

This microscope, (unfortunately no longer in my collection), is a rare binocular microscope constructed by Charles X. Dalton. It is unusual in that although outwardly it appears unsigned, it has a scratched signature under the rotating disc that supports the pillars. This was discovered only when the new owner decided he wanted to disassemble the instrument! The coarse focus is by rack and pinion, while fine is via a nosepiece screw, a method quite out of date by the time this microscope was made. The tapering twin pillars support the inclination joint. The microscope can rotate on the flat tripod foot. There are concentric controls for the mechanical stage, reminescent of Bulloch's. The interocular distance is varied by rack and pinion. There is a swinging substage with separate axes for the mirror and condenser assembly. It stands about 18-19 inches tall as pictured.

HISTORY: The Boston Optical Works were founded by the famous and innovative Robert B. Tolles. His foreman was Charles X. Dalton and Dalton took over on Tolles death. Dalton carried on the unmistakable Tolles style. Tolles is best remembered for his extremely high quality objectives and also for his invention of the technique of using oil immersion for high power objectives. The limb of both Tolles microscopes and this instrument has a rounded edge to the rear corners while the front corners are sharper. Dalton had originally trained with Charles Spencer. An interesting fact known to relatively few, is that C.X. Dalton donated many microscopes to the Billings Collection Museum of the U.S.A. in Washington, DC. Dalton was generally highly regarded as a kind and generous gentleman. Because this microscope left my collection many years ago, I have no further information or details other than is listed above, but nevertheless it is so uncommon I felt it should be included on this website for all to see.