NEQKETTI AND ZAMBRA, HOLBOBN VIADUCT, E.G. 



425 



o 9 

 t 



FIG. 2474. 



FIG. 2475. 



FIG. 2476. 



2476 



2477 



2478 

 2479 

 2480 



2481 



1 15 



Electrical Sportsman. This popular experiment consists of a Leyden 

 jar, and a figure carved to represent a Sportsman shooting; two wires 

 are inserted in the jar, at the end of one some pith birds, the other 

 is brought near the point of the gun. A chain from the prime conductor 

 is connected with the wire communicating with the base of the jar, 

 and as soon as the machine is put in action the birds rise, but fall 

 as if shot immediately the jar is discharged (fig. 2476)1 6 



Electrical Cannons, for firing a mixture of Hydrogen 

 gas and Atmospheric Air by an electric spark 

 (Kg. 2477) 



Electrical Pistol, for the same experiment (fig. 2478) . 

 Apparatus and Material for charging ditto with Gas . 



Electrical Powder Cannon, for firing Gunpowder by 

 charge of a Leyden Jar, similar to one figured in 

 '' Galvanic Section " . from 



16 



7 

 4 



1 1 

 10 

 11 



10 6 



Electric Bomb, or Mortar, of hard wood or ivory, having two wires 

 so arranged that when a large Leyden jar or Electric Battery 

 is discharged through them, a sudden expansion of the air in the 

 Mortar is caused, and will expel with considerable force a small 

 ball, of cork placed nearly air-tight in the barrel of the bomb. If 

 a drop of JEther be placed in the chamber the result is more 

 violent (fig. 2481) 12s. 6d. 15 



2482 Eudiometrical Tube, for exploding detonating mixtures 



of gas by the passage of an electric current or spark 

 passed between two platinum wires. See also 

 " Eudiometer," page 380 10 6 



2483 Volta's Condensing Electroscope (fig. 2412), invented by Yolta, is a 



modification of Singer's and Bennett's Gold Leaf Electroscopes. The metal 

 wire to which the gold leaves are affixed, terminates in a flat metal plate, 

 as seen in the wood-cut, and the instrument is supplied with a second 

 metal plate of similar size, fitted with an insulating glass handle, the 

 one being termed the collecting, and the other the condensing plate ; both 

 the plates are coated with insulating shellac varnish. Particulars of the 

 method of using Volta s Electroscopes will be found in Ganot's Physics. 



Price 1 10 



Volta's Electroscope is sometimes mounted with Light Straws or small 

 Pith Balls instead of Gold leaves. 



