The Optical Magic Lantern Journal (May 1895)

The Optical Magic Lantern Journal and Photographic Enlarger. 83 then letting go. The sound has not stopped though ; it 1s being continued, but by the key held down, which was silent before, and on raising the key it stops at once. Now holding down the bass C as before, strike the G above the struck C, the sound of the G will be heard from the bass C as before. So we might go up, finding eight or ten strings, each one of which will make the low C vibrate, giving out the higher note. And the process may be reversed ; by striking the lowest and holding the highest each will be set vibrating. : Show difference of pitch by open and closed pipes of cardboard. Resonance can also be illustrated by holding an excited fork over different tubes, or one tube shortened by pouring in water as required, It is necessary now to show how vibrations are counted. Expensive apparatus is not necessary. The principles involved can be shown practically, and such apparatus as the siren (though it is easily made) also Savart’s Wheel can be shown as slides, and explained. I remember once being in a like fix myself, and tried all manner of ways out of the diffi culty, when a few days after I espied a lad ; : : : papers to form a stock company to operate it during the playing with the very thing, and he was : delighted to lend it for the benefit of his school fellows. He called it a Water-saw. It was actually a Savart’s Wheel, unmounted. <A toothed disc of metal (tin or iron), provided with two holes equi-distant from its centre, through which was passed an endless cord. By pulling in opposite directions, ;the notched disc is caused to rotate, and if it bevbrought in contact with the edge ‘of card firmly secured, the taps soon blend into a musical sound. Then we come back to the tin whistle or flageolet, of which 2 section should be shown on the screen. It should be shown that it is an open pipe, since it practically terminates at the slit. Show ths form of mouth-piece, by which the air is directed in a thin stream against the thin edge of the opposite side of the embouchure, which sets up a responsive fluttering in the air enclosed in the pipe, the pitch of the fluttering varying with the length of the pipe. Have by you glass or cardboard tubes of the relative lengths, 1 3, 3, 4,3, 8, 48, 2, bringing these fractions to a com. denom. we have 24, 27, 30, 32, 36, 40, 45, 48. If we agree to regard them as so many quarter inches, it will give us one foot for the longest tube and half a foot for the shortest—not an inconvenient length. By blowing over the tops of these, com pare with the flageolet. Show how, when all the holes are closed, we have the long pipe giving the fundamental note, and by opening the lowest hole we shorten the tube by so much corresponding to the next tube, etc. —_—!0!—_— Stereopticon Cyclorama, Wirt reference to the above, which appearcd in our issue for March, Mr. John Winter, Sen., of Syracuse, N.Y., U.S.A., writing to the Editor of our contemporary from whom we quoted, disputes Mr. Chase’s right in claiming to be the inventor, and says :— Kindly permit meto demonstrate a fact in your valuable MaGazine that I may at least enjoy the glory of being the first inventor of the cycloramic camera and the stereopticon cyclorama. While visiting the panorama in Munich, Germany, in 1885, I conceived the idea, and had the invention completed in 1890. My friend, Mr. Emanuel Sands, of Jersey City, interested himself with friends to bring it to Coney Island in operaticn, but was not successful. The proprietors of summer resorts in Rochester, N.Y., and across the Onondaga Lake contemplated to put up buildings and secure the invention ; also the directors of the Syracuse City clectric car-line intended to put up a building on the terminus of their line, to operate it. In 1891 I advertised in the Chicago World's Fair. In 1892 I forwarded photographs of the drawings and description on application, which were never returned. Mr. Charles A. Chase, of Chicago, dated his invention back to the time of Daguerre. (I cannot comprehend how Daguerre could perform that trick with the aid of an oil lamp.) According to the article in the January number, Mr. Chase says he tried the cylindro 5 : graph, and afterwards Mr. Percy S. Marcellus’ cycloramic placing the hands in the loops of the cord, and : camera, and Mr. Marcellus kindly loaned the negative of the Court of Honor, from which he made the stereopticon slides and with such success that he constructed the cyclorama stereopticon exactly like the one shown by my : photograph and description, with the only difference that : his apparatus is suspended from the ceiling and mine rests on the floor. I can prove by the aforesaid parties, by my attorney and numbers of others, my assertion to enjoy at lcast the glory of being the original inventor ot the cyclorama camera and of the stereopticon cyclorama. Wishing the cyclorama success for the enjoyment of the fraternity and the public at large. 20: Bags versus Cylinders. By THe SHowman. AmonG the users of mixed gas jets supplied from cylinders there must be many who, finding they have either to pay an exorbitant price for compressed coal gas, or to use a saturator, have at one time or another asked themselves if, after