. The art of projecting. A manual of experimentation in physics, chemistry, and natural history, with the porte lumière and magic lantern. ro-jection of the properties of matter are chemical, andwill be found described under that head. Diagrams,such as are given in most text-books on mechanics, canbe made upon glass by one of the processes describedon page 184, and will be found very convenient to a lec-turer upon that subject. COHESION. A drop of water or other fluid exhibits this, and maybe projected with the lantern, or with the porte lumiere^and a single lens (Fig. 28). Sprinkle a little l
. The art of projecting. A manual of experimentation in physics, chemistry, and natural history, with the porte lumière and magic lantern. ro-jection of the properties of matter are chemical, andwill be found described under that head. Diagrams,such as are given in most text-books on mechanics, canbe made upon glass by one of the processes describedon page 184, and will be found very convenient to a lec-turer upon that subject. COHESION. A drop of water or other fluid exhibits this, and maybe projected with the lantern, or with the porte lumiere^and a single lens (Fig. 28). Sprinkle a little lamp-black or lycopodium-powderupon one side of a strip ofglass, like a microscope slide-and place it in the properplace for projecting, keep-ing it horizontal that thedust may not slide place a single drop ofwater upon the slide; the powder will prevent it fromspreading upon the glass, and it will gather itself upinto a round globule with some of the dust over its sur-face, making an interesting object upon the screen. Again, a saturated solution of zinc-sulphate is put intoa white glass square bottle, two inches square, and. Fig, 28, PHYSICAL EXPERIMENTS. 47 three or four inches high. Let the bottle be about halffilled with this solution. Into a few drops of bisul-phide of carbon drop a piece of iodine. It will at oncestain the bisulphide a dark-brown color, which shouldthen be carefully dropped upon the solution of zinc,where it will float. If now pure water be carefullyadded, so as to rest upon the solution of zinc, the bi-sulphide will collect into an oblate spheroid, having theappearance of brown-colored glass. A square bottlewill enable one to project it better, as a round bottlewould make a cylindrical lens, and the projection wouldbe indistinct, unless the vessel was quite large. Nearly fill the large tank (Fig. 20) with alcohol, andproject the tank with the lantern, or with the singlelens and porte lumiere. Now drop upon the alcohol,with a glass rod, or other
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherbosto, bookyear1877
