II. REGULATORS (PLACE AND TIME). 319 



This apparatus consists of lightning conductors arranged symmetrically, 

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

 the I. R, Keal 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-Bischofi, 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 the Construction of Scientific In- 

 struments. 



1362. Lightning Conductors (various kinds). 



John Faulkner. 



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 Giessen. 



Dr. Tasche, Giessen. 



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

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



The "current analyser" can 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 Annalen, 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. 



III. APPARATUS FOR ACCUMULATING 

 ELECTRICITY. 



1367. Leyden Jar of five and a half square feet coated 

 surface. Teyler Foundation, Haarlem. 



This jar is one of the ICO jars arranged in four cases, by which Van Marum 

 constructed a battery of 550 square feet coated surface. The coatings of 



TJHI7EE 



