Contrivance For A Watch Lamp Perfectly Safe Which Will Show The
Hour of the Night, without any trouble, to a person lying in Bed.
It consists of a stand, with three claws, the pillar of which is made
hollow, for the purpose of receiving a water candlestick of an inch
diameter. On the top of the pillar, by means of two hinges and a bolt,
is fixed on a small proportionate table, a box of six sides, lined
with brass, tin, or any shining metal, nine inches deep, and six
inches in diameter. In the centre of one of these sides is fixed a
lens, double convex, of at least three inches and a half diameter. The
centre of the side directly opposite to the lens is perforated so as
to receive the dial-plate of the watch, the body of which is confined
on the outside, by means of a hollow slide. When the box is lighted by
a common watch-light, the figures are magnified nearly to the size of
those of an ordinary clock.
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Another Way
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Many natural philosophers, in their eagerness to display the powers of science, have overlooked one of the first duties of life, humanity; and, with this view, have tortured and killed many harmless animals, to exemplify the amazing effects of the a... Curious Transcolorations
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Take a common tumbler or glass jar, and having placed a brass ball in one of the holes of the prime conductor, set the machine in motion, and let the balls touch the inside of the tumbler; while the ball touches only one point, no more of the surfac... Decorations For Sky-rockets Sky-rockets May Be Decorated According
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Construct a machine similar to that in Fig. 25. Its effect will be, that a print, or an ornamented drawing, with any object, such as an ace of diamonds, &c. in the centre F, will be seen as an ace of clubs when placed in the machine, and viewed thro... Double Spiral Wheels For These Wheels The Block Or Nave Must Be
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Fix two or three pointed needles into the prime conductor of an electrical machine, and set the glass in motion so as to keep the prime conductor electrified for several minutes. If now, an electometer be brought within the air that is contiguous to... Example Suppose The Person Wishes His Card To Be The Twentieth
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