274 SEC. 10. ELECTRICITY. 



1357. Indestructible Solid Copper Tape Lightning 

 Conductors. Small and large sizes. Sanderson fy Proctor. 



This form of lightning Conductor possesses the greatest conducting surface. 

 Hitherto it has been made in short lengths riveted together ; now it is made 

 in any length without joints, thereby offering no resistance to the free passage 

 of the electric fluid. 



1358. Copper Hope Lightning Conductors, improved. 

 The smallest and largest sizes. -Sanderson $ Proctor. 



1359. New Lightning Conductor Apparatus. 



Professor Carl Wenzel Zenger, Prague. 



This apparatus consists of lightning conductors arranged symmetrically, 

 balls being used instead of conical points. A plan shows its application to 

 the I. R. Real School, and to the National Theatre at Prague. 



1360. Top of Lightning Conductor. The lower part is 

 made of gun metal, the upper of copper, and the extreme point of 

 gold or silver. Constructed according to the instructions of 

 Professor Ed. Hagenbach-Bischoff, in Basle. G. Linder, Basle. 



The electricity escapes easily through good conductors from points and 

 edges ; the point does not oxidize in the atmosphere, and being a good 

 conductor is not liable to be melted by electricity. 



1361. Needle of Lightning Conductor, brass gilt. 

 Geneva Association for Constructing Scientific Instru- 

 ments. 



1362. Lightning Conductors (various kinds). 



John Faulkner, Manchester. 



Two photographs of expedients for applying lightning conductors to high 

 spires and factory chimneys, and for the repair of high spires and chimneys. 



1363. Models of Lightning-Conductors of the latest con- 

 struction. Mittelstrass Brothers, Magdeburg. 



1364. Apparatus serving for the separation and collec- 

 tion of induced currents, constructed by Dr. Th. Tasche, 

 manufactured by Staudinger & Co'., in Giesseu. 



Dr. Tasche, Giessen. 



1364a. Current Analyser, with glass axis, made by Jung, 

 of Giessen. Physical Institute ( Univ. of Giessen), Dr. Buff. 



The "current analyser" could be occasionally used for experimental re- 

 search in voltaic induction, to separate the two induced currents, and to 

 study the proportion of their intensities or electro-motive forces. See Poggen- 

 dorff's Aunalen, Vol. 127, p. 57. 



1365. Binding Screws for Galvanic Work. 



M. Th. Edelmann, Munich. 



1366. Current-key for Beetz's Compensation Method. 



M. Th. Edelmann, Munich. 



