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
Ch. IX] 
b 1 Block with four guiding cleats of wood. The screw holes in the inside 
cleat at the left and the outside one at the right are made large, and washers 
are used on the screws. This is to make accurate centering possible. 
b 2 Block showing two guiding cleats between the tracks. Only one 
cleat has large screw holes for centering. 
. b 3 The third carrying block with the guide cleats on the outside of the 
■ track rods. Only one has large screw holes for centering. 
b 4 The fourth carrying block with guide cleats at only one end, and with 
centering holes in one cleat. 
At the left Sectional views of the carrying blocks. 
In b i is shown how to make a table for carrying apparatus along the optical 
bench, and at t s, the method of screwing the track tubes to the baseboard. 
In b 4 is shown how to attach a shield with an opening for lantem slides (0). 
two ways: (1) The arc lamp can be put closer to the condenser, 
thus making the beam between the elements diverging instead of 
parallel (fig. 1), or (2) a condenser lens of longer focus can be used 
for the lantern-slide projection. In much of the modem projection 
apparatus the condenser lenses are easily changed (sec fig. 166). 
Fig. 160. Universal Level. 
(Cut loaned by the L. S. Starrett Co.). 
A level like this which serves for vertical and horizontal leveling is very 
convenient and essential for projection work. 
The second method of combined projection is to have two com¬ 
plete lanterns side by side, one for micro-projection and one for 
lantern-slide work. In this case there should be a double-pole, 
double-throw switch; then one can turn either lantern off or on at 
will (fig. 162, 164). 
Finally, in much of the modem apparatus special provision is 
made for combined projection (see fig. 164-176).


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