J.835] 



WRITINGS OF JOSEPH HENRY. 



81 



elements are suspended together from two cross pieces of 

 wood, and the whole number is thus arranged in ciglit sets, 

 •of eleven in each. These are supported b}^ the ends of the 

 •cross pieces in a strong wooden frame, so as to be immersed 

 in eiglit separate troughs: they thus form as many independ- 

 ent batteries, which can be used separately or together as 

 the occasion may require. Each trough is divided into 

 eleven cells by wooden partitions coated with cement. If one 

 of the cells be charged with dilute acid, a single element 

 maybe excited without producing action in any other part of 

 the battery. Each set or battery may also be lifted separately 

 from the frame by its cross pieces, without disturbing the 

 other parts of the apparatus. 



The elements remain stationary, while the troughs are 

 raised to them on a movable platform by the common ap- 

 plication of a wheel and pinion. 



Fig. 1. — Galvanic Battery. 



The general arrangement of the whole may be seen at 

 once by a reference to the perspective drawing, fig. 1: aa, &c., 

 represent the cross pieces resting on the upper part of the 

 frame of the machine ; c c is the movable platform. 



A perspective view of one of the elements on a larger 

 scale is given in fig. 3. a a are two cups of cast copper, with 

 G 



