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Engraving of Mr. J. B. Dancer’s method of illuminating 
opaque objects under the high powers of the microscope. 
At A is shown a concave mirror, having a vertical and 
horizontal movement, mounted over the oblique body of a 
binocular microscope. By this mirror the light is reflected 
down to the Wenham’s prism, and thence through the 
objective to the object. 
Another method . 
B is a representation of a small speculum fixed at the 
end of a brass wire. This is inserted into the vertical body 
just over the fine motion tube at C. The speculum receives 
light at the side of the microscope at D, and reflects it down 
through the objective to the object. If there is any obstacle 
in the way of attaching the small speculum in the vertical 
body as shown at C, it could be fitted to an adapting ring 
between the body and the objective. 
