Bauhaus-Universität Weimar

Titel:
The Book of the Lantern. Being a Practical Guide to the Working of the Optical (or Magic) Lantern. With Full and Precise Directions for Making and Coloring Lantern Pictures.
Person:
Hepworth, T. C.
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit39440/15/
4 
THE BOOK OF THE LANTEBX. 
creasing1 the light from any lantern by using a parabolic 
reflector behind the lamp or candle flame. The passage 
■ translated» runs as follows :— 
“ To construct an ingenious lantern which mar show 
—* * 
things written at a great distance so that they can be 
read— 
*' Let a lantern be made of the same cylindrical figure 
C 
Fig. 2. 
as von see here represented, in whose base let a concave 
mirror he placed, having as parabolic a shape as is possible. 
Within the focus of this mirror let F. the flame of a 
candle, be fixed, and you will have what is required, for 
it will shine with such unwonted splendour as to show bv 
A m 
night, without anv trouble, even the smallest letters when 
r? * 
examined by the aid of a telescope. But persons looking 
at the flame from a distance will think that it is a great 
fire. If the inner sides of the cylinder are fashioned of 
polished tin in the form of an ellipse, they will increase 
the light. But the figure here given will sufficiently show
        

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