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

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 the prime
conductor, it will exhibit signs of electricity, and this air will
continue electrified for some time, even after the machine has been
removed into another room. The air, in this case, is electrified
positively; it maybe negatively electrified by fixing the needles in
the negative conductor while insulated, and making a communication
between the prime conductor and the table, by means of a chain or
other conducting substance.

The air of a room may be electrified in another way. Charge a large
jar, and insulate it; then connect two or more sharp-pointed wires or
needles, with the knob of the jar, and connect the outside coating of
the jar with the table. If the jar be charged positively, the air of
the room will soon become positively electrified likewise; but if the
jar be charged negatively, the electricity communicated by it to the
air will also become negative. A charged jar being held in one hand,
and the flame of an insulated candle held in the other being brought
near the knob of the jar, will also produce the same effect.





Next: Another Electric Orrery See Page 92
Previous: The Electric Explosion

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