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The Optical Magic Lantern Journal and Photographic Enlarger.
223
lantern stage a special form of block is inserted, this block into which the carrier is inserted is provided with springs whereby the carrier is pushed close to the condenser, leaving room for the insertion of another at the side of the first. The two detached slide holders have ends shaped as in Fig. I., excepting that in the other the projecting end is towards the bottom of the slide holder. For use, unframed slides are placed in the holders, one of which is then inserted in to the carrier (previously placed in the lantern stage); one spring pushes it towards the condenser, and on the insertion of the second slide holder, this second one becomes locked and the first is ready to be withdrawn, when the second
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immediately springs into its place at the focal plane. Fig Il. shows the carrier with both holders inserted.
EDUCATIONAL LANTERN,
A convenient form of lantern has been devised by Mr. John Trotter, 28, Gordon Street, Glasgow, for use in schools and colleges. The instrument can be used either for showing slides in the ordinary way, or for vertical subjects.
When tank or similar experiments are shown,
provision is made in the former arrangement
for erecting the image by means of a prism fitted in front of the lens. By lifting up the front, as shown, inserting a mirror and adjusting the prism, the lantern lends itself for vertical work. The condenser is composed of three lenses, two of which are 41 in. diameter.
“SPAR JET.”
This jet, which has been brought out by the wholesale firm ‘Leviathan, London,” is said to give an exceeding bright light. As will be seen in the cut, there are two nipples placed
side by side. The lime used is flat and circular, this being rendered necessary by reason of the size of the spot of light. ~ For general illumination this form has many advantages.
“ REGULATING JET TAP.”
This tap by the same firm is for screwing on the back of a jet, and is provided with a screwdown valve for fine adjustment. Having been adjusted to the desired point, the tap may be then turned completely off without interfering with the adjustment.
SYSTEMATIC LANTERN SLIDE BOX.
Messrs. Butcher & Sons, of Blackheath, have hit upon a happy idea with regard to this box. Each groove is provided with numbers (see cut) from 1 to 50, and a tablet is placed in the
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inside of the lid similarly marked, together with spaces for the name of the slide. Each slide can be thus relegated to its own position with ease, and the contents of any such box can be readily ascertained,
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