Things Worth Knowing
Curious Facts about Authors
All Science Experiments
A Fountain Which Acts By The Heat Of The Sun
In the annexed engraving, Fig. 7, G N S is a thin hollow globe of copper, eighteen inches diameter, supported by a small inverted basin, placed on a stand with four legs, A B C D, which have between them, at the bottom, a basin of two feet diameter....
A Hundred Different Names Being Written On The Cards To Tell The
particular Name any Person thought of. Write on ten cards a hundred different names, observing that the last name on each card begins with one of the letters in the word INDROMACUS, which letters, in the order they stand, answer the numbers 1 to 10...
A Lamp That Will Burn Twelve Months Without Replenishing
Take a stick of phosphorus, and put it into a large dry phial, not corked, and it will afford a light sufficient to discern any object in a room when held near it. The phials should be kept in a cool place, where there is no great current of air, an...
A Liquid That Shines In The Dark
Take a bit of phosphorus, about the size of a pea; break it into small parts, which you are to put into a glass half full of very pure water, and boil it in a small earthen vessel, over a very moderate fire. Have in readiness a long narrow bottle, w...
A Luminous Bottle Which Will Show The Hour On A Watch In The Dark
Throw a bit of phosphorus, of the size of a pea, into a long glass phial, and pour boiling oil carefully over it, till the phial is one-third filled. The phial must be carefully corked, and when used should be unstopped, to admit the external air, a...
A More Powerful Fulminating Powder
The most wonderful instance of chemical detonation is formed by the combination of volatile alkali with silver. Gunpowder, or fulminating gold, are not to be compared with this invention, and the great danger attending its manufacture prevents us fr...
A Person Having An Even Number Of Shillings In One Hand And An Odd
Number in the other, to tell in which hand the odd or even Number is. You desire the person to multiply the number in his right hand by an odd figure, and the number in his left by an even one; and tell you if the products, added together, be odd or...
A Person Having Put A Ring An One Of His Fingers To Name The Person
the Hand, the Finger, and the Joint on which it is placed. Let a third person double the number of the order in which he stands who has the ring, and add 5 to that number; then multiply that sum by 5, and to the product add 10. Let him next add 1 to...
A Powder Which Catches Fire When Exposed To The Air
Put three ounces of rock alum, and one ounce of honey or sugar, into a new earthen dish, glazed, and which is capable of standing a strong heat; keep the mixture over the fire, stirring it continually till it becomes very dry and hard; then remove i...
A Sea-fight With Small Ships And A Fire-ship
Having procured four or five small ships, of two or three feet in length, make a number of small reports, which are to serve for guns. Of these range as many as you please on each side of the upper decks; then at the head and stern of each ship fix ...
A Secret Correspondence By Means Of Invisible Ink
A person wishing to carry on a correspondence with another, and who is fearful of having his letter opened, or intercepted, can adopt the following plan: Write any unimportant matter with common ink, and let the lines be very wide apart: then bet...
A Vessel That Will Let Water Out At The Bottom As Soon As The Mouth
is uncorked. Provide a tin vessel, two or three inches in diameter, and five or six inches in height, having a mouth about three inches in width; and in the bottom several small holes, just large enough to admit a small needle. Plunge it in water w...
A Water To Give Any Metal A Gold Colour
Take fine sulphur and pulverize it; then boil some stale spring water; pour it hot upon the powder, and stir it well together; boil it again, and pour into it an ounce of dragon's blood. After it is well boiled, take it off, and filter it through a ...
A Water Which Gives Silver A Gold Colour
Take sulphur and nitre, of each an equal quantity; grind them together very fine, and put them into an unglazed vessel; cover and lute it well; then set it over a slow fire for 24 hours; put what remains into a strong crucible, and let it dissolve; ...
Account Of The Wonderful Effects Of Two Immense Burning-glasses
Mr. de Tschirnhausen constructed a burning-glass, between three and four feet in diameter, and whose focus was rendered more powerful by a second one. This glass melted tiles, slates, pumice-stone, &c., in a moment; pitch, and all resins, were melte...
Composition I Saltpetre Two Ounces Flour Of Sulphur One Ounce
The Three Magical Parties
The Deforming Mirrors
A Water Which Gives Silver A Gold Colour
Bottles Broken By Air
To Make Squibs And Serpents
The Leech A Prognosticator Of The Weather
To Load Air Balloons With Stars Serpents &c &c When You Fill
To Give Silver-plate A Lustre
To Find The Number Of Changes That May Be Rung On Twelve Bells
To Show The Spots In The Sun's Disk By Its Image In The Camera
To Represent Cascades Of Fire
To Tell The Number Of Points On Three Cards Placed Under Three