284 BENJ. PIKE'S, JR., DESCRIPTIVE CATALOGUE. 

 SET OF ELECTRICAL APPARATUS. PRICE $31 50. 



Consisting of a well-made 7-inch Cylinder Electrical Machine, with 

 mahogany frame, neatly turned pillars, Insulated Prime Conductor, 

 Brass Ball and Wire, Pair of Chains, and Box of Amalgam. Price 

 $14 00. 



2. Lpyden Jar (quart size) $1 25 



3. Jointed Discharger 1 25 



4. Quadrant Electrometer 1 25 



5. Imnge-Plates and Pith-Images . ..J 25 



6. Chime of throe Bells 2 00 



7 Revolving Flier 050 



8. Luminous Spiral Tube 2 00 



9. Cylinder with Dancing Pith 



Balls .-150 



10. Long Hair Man 75 



11. Electrical Chase-4 Revolving 



Horsemen on Insulated Stand. 2 50 



12. Insulating Stool 3 00 



13. Electrical Swan 025 



The above-described Set is one much approved, and is warranted 

 superior to any other Sets that have yet been before the public, for its 

 price ; and the working of the machines is unsurpassed, if equalled, 

 by any of their size. Any portion, or all of this Electrical Apparatus, 

 may be used with a 4|-inch cylinder machine, costing but $8, or 

 5-inch, $10; 6-inch, $12; 8-inch, $16; 9-inch, $18; 10-inch, $20. 

 A 16-inch Plate Electrical Machine, handsomely finished, the Prime- 

 Conductor and Rubber-Conductor of brass, supported on stout 

 swelled glass pillars, having brass sockets and mahogany frame, and 

 mounted on four turned feet. Price $25, or, with the Apparatus, $42. 

 A 20-inch plate Electrical Machine, mounted as the preceding one, 

 but much larger in all its parts, $38, or with above Apparatus, $55. 



Larger Machines, and more extended Apparatus, in great variety 

 of form and price. 



f 4 quart Leyden Jars, in a Mahogany 



Case $6 50 



4 2-quart " " " 8 00 



4 gallon " " " 1000 



Electrical Battery of 



