Bauhaus-Universität Weimar

Optical Projection: A Treatise of the Use of the Lantern in Exhibition and Scientific Demonstration
Wright, Lewis
dependent approval, especially in first-class public institutions ; 
and, so far as I can learn anything at all about them—which 
it has been most difficult to do—their success has been in 
precise proportion to the degree in which the same general 
arrangements have been adopted, though I have not as yet 
heard of equal results having been obtained. I therefore con¬ 
fine myself to what I know and have myself openly tested in 
various public demonstrations. Moreover, everything in this 
chapter except the description and explanation of the instru¬ 
ment in detail, will apply equally to others in proportion to 
the efficiency of their performance. 
92. The Oxy-hydrogen Microscope.—Fig. 102 gives a sec¬ 
tion of the instrument as constructed for the oxy-hydrogen light. 
u represents the lantern condenser, which 1 prefer to make 
y inches in diameter and of triple form, so as to take up an 
angle of 95°, and bring the rays to a focus, if let alone, at 
about G inches in front of the front lens. If the microscope 
be required to fit an ordinary 4-inch lantern front, the arrange¬ 
ment must be slightly different, the lime being in this case 
pushed up so as to give an approximately parallel beam with 
the ordinary double condenser, while a third lens either slides 
or racks in the back-end of the microscope, so as to bring 
the parallel rays to a focus corresponding in character to the


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