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Most Viewed- Never-yielding Cement- The Deforming Mirrors - Aigrettes - A More Powerful Fulminating Powder - A Liquid That Shines In The Dark - Balloon Wheels They Are Made To Turn Horizontally: They Must Be - A Lamp That Will Burn Twelve Months Without Replenishing - To Make Artificial Coruscations - Another Way - Artificial Illuminations - The Magnifying Reflector - The Hour Of The Day Or Night Told By A Suspended Shilling - Another Invisible Green Ink - Another - To Spin Sealing-wax Into Threads By Electricity - Easy And Curious Methods Of Foretelling Rainy Or Fine Weather - A Powder Which Catches Fire When Exposed To The Air Least Viewed- Stars With Points- Winter Changed To Spring - To Take Impressions Of Coins Medals &c - To Tell A Person Any Number He May Privately Fix On - The Boundless Prospect - Vegetable Air-bubbles - The Electric Aurora Borealis - To Tell The Number Of Points On Three Cards Placed Under Three - To Tell The Amount Of The Numbers Of Any Two Cards Drawn From A - To Tell The Amount Of The Numbers Of Any Three Cards That A Person - The Divining Card - The Card In The Opera Glass - To Make Pictures Of Birds With Their Natural Feathers - To Diversify The Colours Of Flowers - Caduceous Rockets They Are Such As In Rising Form Two Spiral - Swans And Ducks In Water - The Mysterious Writing |
Spur FireThis fire is the most beautiful of any composition yet known. As it requires great trouble to bring it to perfection, particular care must be paid to the following instructions. They are made generally in cases about six inches long, but not driven very hard. CHARGE. lb. oz. CHARGE. lb. oz. Saltpetre 4 0 } { Saltpetre 1 0 Sulphur 2 0 } or { Sulphur 0 8 Lamp-black 1 8 } { Lamp-black 4 quarts. This composition is very difficult to mix. The saltpetre and brimstone must be first sifted together, and then put into a marble mortar, and the lamp-black with them, which you work down by degrees with a wooden pestle, till all the ingredients appear of one colour, which will be something greyish, but very near black; then drive a little into a case for trial, and fire it in a dark place; and if the sparks, which are called stars or pinks, come out in clusters, and afterwards spread well without any other sparks, it is a sign of its being good, otherwise, not; for if any drossy sparks appear, and the stars not full, it is then not mixed enough; but if the pinks are very small, and soon break, it is a sign that you have rubbed it too much. This mixture, when rubbed too much, will be too fierce, and hardly show any stars; and, on the contrary, when not mixed enough, will be too weak, and throw out an obscure smoke, and lumps of dross, without any stars. The reason of this charge being called the spur fire is, because the sparks it yields have a great resemblance to the rowel of a spur, from whence it takes its name. As the beauty of this composition cannot be seen at so great a distance as brilliant fire, it has a better effect in a room than in the open air, and may be fired in a chamber without any danger; it is of so innocent a nature, that, although an improper phrase, it may be called a cold fire; and so extraordinary is the fire produced from this composition, that, if well made, the sparks will not burn a handkerchief when held in the midst of them; you may hold them in your hand while burning, with as much safety as a candle; and if you put your hand within a foot of the case, you will feel the sparks fall like drops of rain. Next: To Make Touch Paper Previous: How To Meal Gunpowder Brimstone And Charcoal
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