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

Fulminating Powder

This powder is made by rubbing together, in a hot marble mortar, with
a wooden pestle, three parts, by weight, of nitre, two of mild
vegetable alkali, and one of flowers of sulphur, till the whole is
accurately mixed. If a drachm of this powder be exposed to a gentle
heat, in an iron ladle, till it melts, it will explode with a noise as
loud as the report of a cannon.





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