. The art of projecting. A manual of experimentation in physics, chemistry, and natural history, with the porte lumière and magic lantern. e mirror inclined at an angle of 45°, andwhen so placed that the beam of light from the lanternfalls upon it, it is reflected perpendicularly upwardsupon a lens that converges the light when it passes PROJECTIONS. 43 through the objective above it, and falls upon asecond mirror, which is so mounted as to allow re-flection in any direction. The same device is madea part of the standard lantern of the country, andcalled the College La?iter?ty^ manufactured by
. The art of projecting. A manual of experimentation in physics, chemistry, and natural history, with the porte lumière and magic lantern. e mirror inclined at an angle of 45°, andwhen so placed that the beam of light from the lanternfalls upon it, it is reflected perpendicularly upwardsupon a lens that converges the light when it passes PROJECTIONS. 43 through the objective above it, and falls upon asecond mirror, which is so mounted as to allow re-flection in any direction. The same device is madea part of the standard lantern of the country, andcalled the College La?iter?ty^ manufactured by GeorgeWale & Co., of Hoboken, N. J. By an ingeniousarrangement the change from the horizontal to thevertical can be made in less than half a minute. Themicroscope, the polariscope, the electric-light regulator,and several other fixtures, are fitted to this instrument,making it a most perfect and complete lantern. Such a vertical attachment as is shown in Fig. 25 isapplicable to the porte lumiere, but one can be extem-porized, that will do good service, with such material asis accessible to every one. An iron filter-stand, such. Fig. 27. as is in common use in every chemical laboratory, maybe taken, and the condensing lens c laid upon the loweror largest ring, and the objective, Oy upon the upper orsmaller one, as shown in Fig. 27. Below the lower ringa plain mirror m may be placed, at such an inclinationthat the beam of parallel rays falling upon it from the 44 THE ART OF PROJECTING. porte lutniere will be reflected upward through the twolenses upon another smaller mirror, n^ which may beheld in a retort-stand, and the beam directed to theproper place. PHYSICAL EXPERIMENTS. DIVISIBILITY OF MATTER. A good way to show the minute divisibility of matteris to dissolve, in water, a small quantity, say a gram, ofcupric sulphate, and add enough ammonia-water tomake a clear, blue solution. Put it into the chemicaltank, having measured its capacity in cubic centimeters,or inches, fill
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherbosto, bookyear1877
