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
Conduct of an Exhibition or Demonstration with the 
Projection Microscope 
§ 400. What is said in Ch. I, § 21-40 is entirely applicable to 
the projection microscope by substituting microscopic specimens 
for the lantern slides. Only from the greater difficulty and pre¬ 
cision demanded in using the projection microscope, it is impera¬ 
tive that the operator be prepared, hence the greater necessity of 
making certain that everything is in absolute order before the 
lecture begins. 
If any of the projection objectives (i. e., those of 125 to 20 mm. 
focus) have iris diaphragms, open these as widely as possible. 
Never try to project with the iris of the objective partly closed. 
Fig. 148. Slide-Tray with Masked Preparations to be Used in 
Projection. (About X size). 
Three series arc here represented on different sized slides. 
The sections to be shown arc not covered with the masking paper. The 
numeral on the side give the number of the series (ser. 90, ser. 17, ser. 15). On 
each slide is also the number of the slide in the series as ser. 15, slide 57, 63, 67, 


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