The book of lantern ; being a practical guide to the working of the optical (1888)

Record Details:

Title:
The book of lantern ; being a practical guide to the working of the optical
Date:
1888
Publisher:
London : Wyman & Sons
Volume:
The book of lantern ; being a practical guide to the working of the optical (or magic) lantern ; with full and precise directions for making and colouring lantern pictures
Leaf #:
000195
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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182 THE BOOK OF THE LANTERX. speed of either can be varied at will by the operator. The effect upon the screen is most curious, for it seems to be covered with a lacework of geometrical patterns which constantly change their form. A very favourite experiment with the lantern, but one which it is by no means easy to perform, is the decomposi- tion of light by means of a prism. For the most perfect effects the electric light is necessary, but as this is beyond the reach of most of us,—at any rate, for the present,—we must be content with what can be done with the ordinary limelight. The simplest way of showing the spectrum with the lantern is to remove the objective and to place in the lantern stage a card with a slit in it, as shown in the cut (fig. 47). This slit should be about an inch in length, and not more than one-twentieth of an inch in breadth. The card should be placed on the stage of the lantern in a IIG. 47. h or i z ontal position and focussed upon the screen in front. A prism is then brought into the path of the slice of light thus formed, and it will be so far bent aside as to exhibit the. colours of the spectrum on the ceiling of the room (fig. 48). FIG. 48. The prism will require a little turning about before this result is arrived at. But at the best this method of show- ing the spectrum is but a makeshift one; it presents, however, an easy method of demonstrating the decom- position of white light. A preferable mode is to use a