Bauhaus-Universität Weimar

Optic Projection: Principles, Installation and Use of the Magic Lantern, Projection Microscope, Reflecting Lantern, Moving Picture Machine
Gage, Henry Simon and Henry Phelps Gage
Fig. 131. Filar Micrometer Ocular. 
{Cut loaned by the Bausch ôr Lamb Optical Co.). 
This filar micrometer ocular is of the Ramsden type and consists of a positive 
ocular with a movable hair line and two reference lines at right angles to each 
other as shown in A. The movable line must be carried over the entire length 
of the object to be measured by rotating the drum. 
A Field of the filar micrometer showing the movable and the cross lines, 
and the comb. The teeth serve to measure the total revolutions of t he'd rum. 
Arc Supply 
Fig. 132. Illuminating Objects of Various Sizes in Micro-Projec 
tion with the Main Condenser Only. 
The object must be put in the cone of light at a point where it will be fully 
For high powers it will be at or very near the focus (/). For larger objects 
and low powers the object is at 2 oror even closer to the condenser face. 
A re Supply The right-angled carbons of the arc lamp. 
L, L, The first and second elements of the triple condenser. 
Water-Cell The water-cell for absorbing radiant heat. It is in the parallel 
beam between the first and second elements of the condenser. 
Axis The principal optic axis on which all the parts are centered. 
If only the main condenser is used (fig. 121), the cone of light 
from the condenser must be sufficient to fill the aperture of the 
projection objective. This requires that the second element of the


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