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J. B. DANCER MICROSCOPE:

c. 1855

Signed on the foot: 'J.B. DANCER, OPTICIAN, MANCHESTER'

Serial Number:None

DESCRIPTION HISTORY

JB Dancer MicroscopeJB Dancer Microscope 2

DESCRIPTION

JB DanceER Microscope closeup JB Dancer Substage Signed on the foot 'J.B. DANCER, OPTICIAN, MANCHESTER', printed trade lable on the inside of the door. It is very similar to the microscope Dancer himself posed with in his microphotograph, #33. The microscope stands on a 'Y' shaped brass foot with two slender turned columns supporting the limb on trunions. At the bottom of the limb is a circular column on which the plano-concave mirror can be slid up and down. Above The mirror is a semi-mechanical stage with 2 knurled nuts at the back allowing the user to move the stage in very small increments; its intention is for coarse movement manually and fine movement through these controls, each moving the sprung stage in 45 degree angles opposite of each other. The stage also has a main slide carrier which can be slid back and forth but not side to side. The underside of the stage is blackened and has an arm that can be swung into the optical axis of the instrument which is used to hold the dark well. The main body tube is held onto the limb via two brackets which hold fast the external body tube allowing a second internal tube to be used for focusing via an internal rack. This method was later dropped for a fixed pinion at the back which racked the whole body tube up and down. Very few with the type of coarse focusing seen here have survived. The fine focus is via a knurled nut at the side acting on a sprung lever which raises and lowers the objective. The RMS thread was standard starting about 1858, so this instrument prob dates from that year or earlier. The first drawer contains an interesting engraving of the microscope showing all of its accessories (three of four quarters present) and other paperwork relating to the powers of the lenses.

In addition to the mahogany case with seven drawers and attached trade card, the accessories with the microscope include:

  1. a divisible objective with matching external stop for the low power, and a matching lieberlkuhn for high power
  2. Another objective with no additional fittings
  3. an outer element for another divisible objective now lacking the inner element
  4. a polarizer which attaches under the stage with a matching analyzer which screws on between the nosepiece and the objective
  5. a parabolic stage side reflector
  6. 2 darkwells which fit into the integral swing-out darkwell holder under the stage
  7. a hand lens in a brass fitting
  8. dissecting scalpel
  9. a livebox
  10. a deep depression slide
  11. two brass plates with tiny holes; one with two holes, each near the end, and another with three holes near the center
  12. an ocular micrometer in cardboard case
  13. a brass tool with two short rods protruding,as pictured in the illustration, but of uncertain purpose, as it fits nothing on the microscope this observer could find
  14. a small glass-stoppered bottle
  15. a single eyepiece labelled 'B'
  16. a brass piece which fits into the hole in the stage from above and has a cylindrical depression with a small hole in its center
  17. a bench bullseye condenser

It is noted on the paper with tables of magnifications that the ocular micrometer was to be used 'only' with the 'A' eyepiece (which is unfortunately no longer present). Most of these accessories are pictured in the enclosed engraving.

Dancer Trade LabelDancer Case Open dancer accessories in drawers

Dancer Mag Chart

HISTORY OF J.B. DANCER MICROSCOPES

James Benjamin Dancer was a famous maker of all kinds of scientific apparatus including instruments for physics experiments, microscopes, and others. He is well-remembered as the inventor of the microphotograph and much has been written about him. His microscopes are extremely well made and a priviledge to handle. In making microscopes, he shared two characteristics with James Smith. First was the use of divisible objectives and the second was that the shape of his liveboxes are very similar to Smith's. In addition, the design of this microscope is strikingly similar to the Powell and Lealand Iron Stand microscope. Both have a single large focusing knob at the side acting on an internal rack and they are of similar size. Both have similarly shaped limbs, stage shape and sizes.
Other Dancer microscopes on this site include his Cloth Inspection Microscope and one of his thread counting microscopes.

Dancer Engraving 1 Dancer Engraving 2

Dancer Accessories