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
As here shown the substage condenser and mirror have been removed, and 
also the draw-tube and ocular (see fig. 147, 192 for the ordinary microscope 
with substage condenser, draw-tube and ocular in position). 
The lamp, condenser and microscope are on independent blocks and can be 
moved to any desired position on the baseboard. 
A The ammeter to indicate the amount of current. 
R Adjustable rheostat. This rheostat is adjustable between 10 and 20 
amperes. The arrow indicates the direction of increase in current. 
A Adjustable drawing shelf attached to the front legs of the table. In this 
picture the shelf supports the stage of the projection microscope (fig. 121), and 
a box of demonstration specimens. 
The scale of the picture is indicated by the 10 cm. rule just above the table 
drawer at the right. 
If the tube of the microscojK? is large it is an advantage, but with 
the small tube one can do much. If the ocular is not to be used, 
then it is better to remove the draw-tube so that only the main 
tube remains. One should be sure that the interior of the tube is 
dull black (§ 370). 
§ 394. Magic lantern with rods, and an ordinary microscope.— 
If the magic lantern has the simple construction with rods and feet 
(fig. 32, 33, 36) an ordinary microscope can be used with it as 
follows : Remove the rods, bellows and projection objective, and 
support the arc lamp and the condenser on a block which will lift 
them high enough so that the microscope in a horizontal position 
will be in the optic axis. Place all on a baseboard with guides 
(fig. 146). Clam]) the microscope to a suitable block with grooves 
or cleats to enable one to move the block accurately along the 
guides. When properly centered this form of apparatus works 
§ 394a. For a water-cell one of the plane-sided glass boxes found on the 
market can be used, or a cell can be prepared in the laboratory as follows: 
Select some good plane and clear glass. For the ends of the box make two 
strips about 2>4 cm. (1 in.) wide and about 10 cm. (4 in.) long. For the sides 
use two sheets about 10 cm. (4 in.) wide and II cm. (4>i'in.) long; and for 
the bottom a rather thick sheet or strip about 11 cm. (4>a in.) long and 3 cm. 
(1 ‘4 in.) wide. The pieces of glass are then put together by placing the bottom 
on a level table and the other pieces in position and held in place by a string 
or by narrow strips of gummed paper. 
The joints are then gone over carefully with an artist’s brush dipped in 
Ripolin white paint or Valspar varnish. Each coat should be allowed to dry 
thoroughly before adding the next, that is, for two to five days. Finally one 
can add water to see if the joints are all tight. If not, dry the glass box and 
then add more of the Ripolin paint or Valspar varnish.


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