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Portable Steam Engine, 1877. Portable steam engines provided belting power on farms to run threshing machines, circular saws, etc. This Frick model steam engine operated regularly from 1877 to 1949.
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Edison with his Phonograph
In 1878 Mr Edison made a number of phonographs, which were exhibited in America and Europe, and attracted universal attention. The records were made in these on soft tinfoil sheets fastened around metal cylinders. For a while Mr Edison was compelled to suspend work on this invention, but soon returned to it and worked out the machine as it exists practically to-day. It occupies about the same space as a hand sewing-machine. A light tube of wax to slide on and off the cylinder is substituted for the tinfoil, which had been wrapped round it, and the indenting stylus is replaced by a minute engraving point. Under the varying pressure of the sound-waves, this point or knife cuts into the tube almost imperceptibly, the wax chiselled away wreathing off in very fine spirals before the edge of the little blade, as the cylinder travels under it. Each cylinder will receive about a thousand words. In the improved machine Mr Edison at first employed two diaphragms in 'spectacle' form, one to receive and the other to reproduce; but he has since combined these in a single efficient attachment.
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Breech loading Gingal (Chamber out)
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Image 103
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The string telephones which for several years have been flooding the boulevards and the streets of the different cities of Europe, and whose invention dates back, as we have seen, to the year 1667, are very interesting apparatuses by them themselves, and we are astonished that they did not appear rather in the physics cabinets. They consist of cylindrical-conical tubes of metal or cardboard, one end of which is closed by a stretched membrane of parchment, in the center of which is fixed by a knot the string or cord intended to bring them together. When two tubes of this kind are thus joined together and that the wire is tight, as shown, it suffices for a person to apply one of these tubes against the ear and for another person to speak very close to the opening of the other tube, so that all the words spoken by the latter are immediately transmitted to the other, and one can even converse in this manner in an almost low voice.
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