Double Spiral Wheels For These Wheels The Block Or Nave Must Be
as long as the height of the worms, or spiral lines, but must be made
very thin, and as light as possible. In this block must be fixed
several spokes, which must diminish in length, from the wheel to the
top, so as not to exceed the surface of a cone of the same height. To
the ends of these spokes nail the worms, which must cross each other
several times: close these worms with illuminations, the same as those
on the single wheels; but the horizontal wheel you may clothe as you
like. At the top of the worm place a case of spur-fire, or an amber
light.
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Chemical Illuminations
Put into a middling-sized bottle, with a short wide neck, three ounces of oil or spirit of vitriol, with twelve ounces of common water, and throw into it, at different times, an ounce or two of iron filings. A violent commotion will then take place,... Chinese Fountains
To make a Chinese fountain, you must have a perpendicular piece of wood, seven feet long, and two inches and a half square. Sixteen inches from the top, fix on the front a cross piece one inch thick, and two and a half broad, with the broad side upw... Composition I Saltpetre Two Ounces Flour Of Sulphur One Ounce
camphor half an ounce, yellow amber half an ounce, charcoal-dust three-fourths of an ounce, salt of Benzoin half an ounce, all powdered very fine and well mixed. II. Saltpetre twelve ounces, meal-powder three ounces, frankincense one ounce, myrrh h... 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 ... Cork Heavier Than Lead
Let a large piece of cork be pendent from one end of a balance beam, and a small piece of lead from the other; the lead should rather preponderate. If this apparatus be placed under a receiver on the pump, you will find that when the air is exhauste... Curious Account Of The Electric Effects Of A Russian Climate
Mr. AEpinus in a letter to Dr. Guthrie, relates the following phenomena, which took place in Russia, when a severe frost had continued for several weeks. Mr. AEpinus was sent for to the palace to see an uncommon phenomenon. On going into the apar... Curious Effects Of Oil Upon Water And Water Upon Oil
Fasten a piece of pack-thread round a tumbler, with strings of the same from each side, meeting above it in a knot at about a foot distance from the top of the tumbler. Then putting in as much water as will fill about one-third part of the tumbler, ... Curious Experiment On Rays Of Light
That the rays of light flow in all directions from different bodies, without interrupting one another, is plain from the following experiment:--Make a little hole in a thin plate of metal, and set the plate upright on a table, facing a row of lighte... Curious Experiment With A Glass Of Water
Saturate a certain quantity of water in a moderate heat, with three ounces of sugar; and when it will no longer receive that, there is still room in it for two ounces of salt of tartar, and after that for an ounce and a drachm of green vitriol, near... Curious Experiment With A Tulip
The bulb of a tulip in every respect resembles buds, except in their being produced under ground, and include the leaves and flower in miniature, which are to be expanded in the ensuing spring. By cautiously cutting in the early spring, through the ... Curious Experiments With A Viper
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
Put half a table-spoonful of syrup of violets and three table-spoonfuls of water into a glass; stir them well together with a stick, and put half the mixture into another glass. If you add a few drops of acid of vitriol into one of the glasses and s... Dancing Balls
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
to fancy. Some are headed with stars of different sorts, such as tailed, brilliant, white, blue, and yellow stars, &c. Some with gold and silver rains; others with serpents, crackers, fire-scrolls, and marrons; and some with small rockets and other de... Different Degrees Of Heat Imbibed From The Sun's Rays By Cloths Of
different Colours. Walk but a quarter of an hour in your garden, when the sun shines, with a part of your dress white, and a part black; then apply your hand to them alternately, and you will find a very great difference in their warmth. The black ... Dioptrical Paradox
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
as long as the height of the worms, or spiral lines, but must be made very thin, and as light as possible. In this block must be fixed several spokes, which must diminish in length, from the wheel to the top, so as not to exceed the surface of a cone ... Easy And Curious Methods Of Foretelling Rainy Or Fine Weather
If a line be made of good whipcord, that is well dried, and a plummet affixed to the end of it, and then hung against a wainscot, and a line drawn under it, exactly where the plummet reaches, in very moderate weather it will be found to rise above i... Easy Method Of Making A Rain Gauge
A very simple rain gauge, and one which will answer all practical purposes, consists of a copper funnel the area of whose opening is exactly ten square inches: this funnel is fixed in a bottle, and the quantity of rain caught is ascertained by multi... Easy Method Of Obtaining Flowers Of Different Colours From The Same
Stem. Scoop out the pith from a small twig of elder, and having split it lengthwise, fill each of the parts with small seeds that produce flowers of different colours, but that blossom nearly at the same time. Surround them with earth; and then tyi... Electrified Air
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
from the top; and the first time of making the heaps, he says it is in the third heap; you then look at the table in the perspective, and you see that the first figure is two; you, therefore, put that heap in the middle of the pack. The second and thi... Example Suppose The Three Cards To Be Ten Seven And Six As
before; then, each of those numbers subtracted from seventeen, the remainders will be respectively, seven, ten, and eleven, which, added together, make twenty-eight, to which the single card you drew being reckoned as one, and added, makes twenty-nine... Example Suppose The Two Cards To Be As Before Ten And Seven Then
the person deducting ten from twenty-six, there remain sixteen, and deducting seven from twenty-six, there remain nineteen; these two remainders added together make thirty-five, which you subtract from fifty-two; and there must remain seventeen for th... Experiments With Sparrows
Count Morozzo placed successively several full-grown sparrows under a glass receiver, inverted over water. It was filled with atmospheric air, and afterwards with vital air. He found, First.--That in atmospheric air, HOURS MIN. The firs... Exploding Gas Bubbles
Adapt the end of a common tobacco-pipe to a bladder filled with hydrogen gas, and dip the bowl of the pipe into soap-suds, prepared as if for blowing up soap bubbles; squeeze out small portions of gas from the bladder into the soap-suds, and the bub... Exploding Salt
If a small quantity of powdered charcoal and hyper-oxymuriate of potash be rubbed together in a mortar, an explosion will be produced, and the charcoal inflamed. Three parts of this salt, and one of sulphur, rubbed together in a mortar, produce a vi... Feathers Heavier Than Lead
At one end of a fine balance, hang a piece of lead, and at the other as many feathers as will poise it; then place the balance in the receiver. As the air is exhausted, the feathers will appear to overweigh the lead, and when all the air is drawn of... Fire Globes For The Water
Bowls for water-globes must be very large, and the wheels on them of ten sides: on each side nail a piece of wood four inches long; and on the outside of each piece cut a groove, wide enough to receive about one-fourth of the thickness of a four-oun... Fixed Sun With A Transparent Face
To make a sun of the best kind, there should be two rows of cases, which should show a double glory, and make the rays strong and full. The frame or sun-wheel must be made thus: have a circular flat nave made very strong, 12 inches diameter; to this... Flowers Curiously Affected By The Sun And The Weather
The petals of many flowers expand in the sun, but contract all night, or on the approach of rain; after the seeds are fecundated the petals no longer contract. All the trefoil may serve as a barometer to the husbandman; they always contract their le... Fulminating Gold
Put into a small long-necked bottle, resting on a little sand, one part of fine gold filings, and three parts of aqua regia, (nitro-muriatic acid.) When the gold is dissolved, pour the solution into a glass, and add five or six times the quantity of...