Bauhaus-Universität Weimar

Titel:
The Sciopticon Manual, Explaining Lantern Projections in General and the Sciopticon Apparatus in Particular Including Magic Lantern Attachments, Experiments, Novelties, Colored and Photo-Transparencies, Mechanical Movements, etc.
Person:
Marcy, L. J.
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit39449/185/
SCIOPTIC ON MANUAL. 
193 
last fifty years, and still made by Duboscq, and other 
French manufacturers, would be the best form ; and, as re¬ 
gards the equal distribution of light on the screen this is 
true, but when such lenses are thus used and of sufficient 
size to secure this result, their errors of spherical aberration 
and want of flatness become unendurable. 
We are then fenced in on either side by the necessity of 
a large and short lens to secure an equal illumination, and 
the difficulty in securing flatness or correction under these 
conditions. 
The most successful compromise which we have yet found 
in this connection is the gas microscope objective, of 11-inch 
focus, made by Mr. J. Zentmayer, the well known manufac¬ 
turer of microscopic stands and lenses. 
With one of these, a well defined object, such as a lady- 
bug, mosquito, or the like, may be thrown on the screen 
with a clear image, pretty well defined up to the margin, 
and a field of light so brilliant and regular that it is hardly 
distinguishable from that of an ordinary magic lantern pro¬ 
jecting a colored glass slide of the same object. Of course, 
with such a power, very minute objects must be rejected, 
but by a judicious selection a large series of interesting ones 
can be secured, such as the lady bug or mosquito already 
mentioned, the ant lion, field spider, and various water 
insects or larvæ of mosquitoes, and the different sorts of 
flies ; also wood sections, and even objects so small as the 
eye of a dragon fly, but, above all, with this power may be 
most successfully shown what are by far the most popular 
illustrations with the gas microscope, such living specimens 
as the various larvæ above mentioned, and such other 
things as are to be found in stagnant water. For these tin- 
very simple and effective form of life slide, devised by Mr. 
S. Holman, Actuary of the Franklin Institute, Philadelphia, 
is invaluable.
        

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