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] 
2 53 
§ 385. Kind and color of paper for the masks.—The best paper 
to use is one that allows only a moderate amount of light to pass, 
and that cuts out the green-blue end of the spectrum. 
The color found best for this is an aqueous solution of the 
microscopic stain known as “Orange G.” For the quality of 
paper, a white linen bond paper of moderate weight is used. It is 
stained by soaking it a few minutes (10-30) in a saturated aqueous 
solution of the “Orange G.” It is then hung up to dry. 
Fig. 143. Slide of Serial Sections with Mask. 
The sections to be demonstrated are left uncovered. 
Sus (Sus scrofa, the pig). 
Ser. 11 This shows that the slide is from the 11 th series of pig embryos. 
si 60. The 60th slide of series 11. 
Sec isu- This indicates that the sections of this embryo were cut 15 microns 
(.015 mm., .00058 in.) thick. 
1QOO The year in which the series was prepared. 
11 60 At the left; series 11, slide 60. 
Paper thus colored allows a moderate amount of light to pass, 
and allows practically all of the long waves of red and infra-red to 
pass, so that it will not bum very quickly in the focus of the con¬ 
denser. If black paper were used it would bum almost instantly 
in the focus. Of the many yellows and oranges tried for masks the 
“Orange G” proved most satisfactory. 
§ 386. How to employ the masks.—The paper is cut of the 
right size for the slide and then square or round holes arc made in 
it to give a clear field for the different objects to be shown on the 
slide, then it is pasted on the cover-glass (fig. 143). It is put on


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