280 SEC. 10. ELECTRICITY. 



silk-paper. They are accordingly not copies, but true originals, produced by 

 the discharge. 



1388. Framed Table, with electric dust figures. 



Prof. W. von Bczold, Munich. 



VI. APPARATUS FOR PRODUCING AND OBSERV- 

 ING EFFECTS OF CONTINUOUS ELECTRIC 

 CURRENTS. 



a. HEATING AND LUMINOUS EFFECTS. 



1389. Diagram showing the Amounts of the Electro-motive 

 Force, and the Peltier and Thomson Effects in a Thermo- 

 electric Circuit of Iron-Copper, both junctions being at 

 temperatures under the neutral point. For teaching purposes. 



Professor Tait, Edinburgh. 



1390. Peltier's Apparatus, for studying the effect of heat in 

 metals subjected to the action of electricity. 



Conservatoire des Arts et Metiers., Paris. 



b. CHEMICAL EFFECTS. 



1391. Apparatus for the polar Decomposition of Water by 



means of atmospheric electricity or the currents of the ordinary 

 electrical machine. The gases are collected in fine thermometer 

 tubes, by which means their absorption by the electrolyte is avoided. 



Dr. Andrews, F.R.S. 



139 la. Apparatus for Decomposition of Water, peculiar 

 construction, with graduated tubes for the separated gases and for 

 the detonating gas. Warmbrunn, Quilitz, $- Co., Berlin. 



1392. Bottle, containing fragments of pure Electro- 

 deposited Metallic Antimony. George Gore, F.R.S. 



(See Philosophical Transactions of the Royal Societ}', 1857, 1858, and 

 1862.) 



1393. Two Specimens of Electro-deposited Antimony ; 



one of the explosive, and one of the pure variety. 



, George Gore, F.R.S. 



1394. A Bare Specimen of pure Carbon, deposited by 

 means of an electric current upon a rod of platinum. 



George Gore. F.R.ft. 



c. ELECTRIC DIFFUSION AND CHANGE OF SURFACE-TENSION. 



1395. Apparatus for producing Vibrations and Sounds, 



and an intermittent electric current by means of the electrolysis of 



