1835] WRITINGS OP JOSEPH HENRY. 83 



There are two of these for each of the eight batteries, and 

 when in their places, one unites all the zinc, and the other 

 all the copper, so that the battery becomes a " calorimotor " of 

 a single element or pair. If with this arrangement the sev- 

 eral batteries be connected, zinc to zinc and copper to cop- 

 per, by conductors reaching from one to the other, the whole 

 apparatus of eighty-eight elements becomes a large " calori- 

 motor" of a single pair; but if the copper of the first be 

 united to the zinc of the second, and so on, it then forms a 

 "calorimotor" of eight elements, and by a simple change 

 may be reduced to one of four, or of two elements. 



The other set of connectors consists of short pieces of thick 

 copper plate, the ends of which are bent down at right angles, 

 so as to dip into the cups of mercury : they connect the cop- 

 per of one element with the zinc of the next. Ten of these, 

 intended to unite the elements of one battery, are shown in 



"Fig. 5. — Alternate or Serial Connector. 



fig. 5. They are attached crosswise to a slip of harness leather, 

 which, by its pliability, permits them to fit loosely into the 

 cups, while it enables the whole set to be removed as one 

 piece. When these connectors are in their places, and the 

 several batteries united, the copper pole of the one, with the 

 zinc pole of another, and so on, the whole series forms a 

 " deflagrator " of eighty-eight elements. 



The different arrangements of the several connectors will 

 be readily understood by a reference to the plan drawing, 

 fig. 2, which exhibits one-half of the whole apparatus ar- 

 ranged as a " deflagrator " of forty-four elements, and the other 

 half as a " calorimotor" of four pairs. By closely inspecting 

 the drawing, it will be seen that the connexion in the upper 

 half of the figure is from the copper of the first element 

 to the zinc of the next, and so on througft the entire series 

 of forty-four elements. In the lower half the union of cop- 

 per and zinc takes place only between the poles of the dif- 



