The Optical Magic Lantern Journal (November 1896)

192 just at the turn, the thumb of the left hand | must be brought sharply towards the hand bringing the next slide with it ; but when it is | brought towards the operator, the position of left hand is reversed, the thumb being rested on centre of slide carrier, and middle finger behind sliding part. Better work can be done with thumb and finger than if other fingers are used. The time occupied in dissolving off and on is about the same as if two lanterns were | used, and the appearance nearly so; in fact, while the darkening of screen is only momen| tary, and with practice would be scarcely noticeable, but, of course, slow melting away ib impossible. The dissolving fan may be fixed to the lantern stand, but is much better if secured to | the right hand of the lantern itself (looking from the screen) ; this is easily done if it has an extended body, and once fixed, need not be disturbed. A fan to answer this purpose cannot be obtained commercially, so I will venture to suggest how it may be made. The materials required are a piece of fairly stout tin, about 8 inches square, a piece of ,5, or 3 inch brass or iron rod about 18 inches long, and a piece of tube 4 or 5 inches long, in which the rod will work easily. Measure from top of objective to the base of the lantern—this will be about 7 inches—open a pair of compasses 8 inches (one inch is allowed so that no light can possibly pass) and resting upon the bottom right hand corner of tin, describe a section of circle which will measure about 9 inches from end toend. Next measure outside of objective, probably 24 inches, allow one inch, and resting compasses On same spot for centre, describe instruction shall contain a full statement of the another section of circle with the compasses | open 44 inches, then cut out as per shape shown at a, and turn the straight edge of tin round the rod, making it into the form of a tube which | will fit the rod tightly. Now angle, and secure w the tube to the -< body of the lan» tern, 10 inches of a rod c are left to 7 work in the tube cut to the desired length according to make of lantern, the latter will also govern the method of fixing tube, etc. bend 8 inches of | for and the support and maintenance of said rod B at a right | instruction for the year beginning on the first The Optical Magic Lantern Journal and Photographic Enlarger. $100,000 for Lantern Work. J ‘ cass r N act has come into force in America ks fee in order to provide additional facili cy & ties for free instruction in natural « iG LN history, geography, and kindred subjects, by means of pictorial representation and lectures. This applies to the free common schools of each city and village of the State that _ has, or may have, @ superintendent of free only an adept would notice the difference, | gommon schools, The particulars are thus enumerated :-— Section 1.—The State superintendent of ' public instruction is hereby authorised to furnish additional facilities for instruction in natural history, geography, and kindred subjects, by means of pictorial representation and lectures, to the free common schools of each city and village of the State that has, or may have, a superintendent of free common schools. The | local school authorities may, in their discretion, cause the aforesaid illustrated lectures to be : repeated to their artisans, mechanics and other _ citizens on the legal holidays and at other times. Any institution instructing a teachers’ training class, or any union free school may | have the free use of the apparatus provided by this act upon the payment to the superintendent of schools loaning the same of necessary expenses incurred in such use or for any loss or injury to said property. Said superintendent may, from time to time, establish the rules and regulations and make and enter into the contracts necessary for carrying out the provisions of this act. SECTION 2.—The annual report of each school superintendent to the department of public extent to which the instructions described may be given, and his judgment of the usefulness of the same. SECTION 3.—The sum of twenty-five thousand dollars is hereby appropriated from any moneys not otherwise appropriated, for the preparation day of January, eighteen hundred and ninetyfive, payable by the treasurer upon the warrant of the comptroller, upon vouchers approved by the superintendent of public instruction and | audited by the comptroller; and the sum of 2 ] 7 aes eee oe twenty-five thousand dollars shall be appro priated annually thereafter, in the general appropriation bill, for the preparation for and the support and maintenence of said instruction for the term of four years from the first day of January, eighteen hundred and ninety-five.