THE SWITCHBOARD AND ARRANGEMENT OF 
STORAGE BATTERY AT SIMPSON COLLEGE. 
BY JOHN L. TILTON. 
As it has not been possible for us to have the street 
current in the daytime, nor up to the present to have our 
own lighting plant, it has been our custom for several years 
to charge storage cells in the evening by means of a 110- 
volt street current passed through a water rheostat. This 
method of reducing the current was so unsatisfactory that 
we purchased a rotary transformer, one end of which is a 
motor, run by the 110-volt current, the other a 15-volt 
dynamo, and installed a suitable storage battery. The 
plan of the arrangement of battery and switchboard, which 
has proved very satisfactory, may be of value to others. 
The different blocks of brass f of an inch thick are 
screwed, as illustrated, to a block of wood-fibre through 
which the necessary wires pass. From a, as marked in the 
diagram, a wire runs to the positive pole of the first cell, 
from h a wire runs to the negative pole of the first cell, 
from c to the positive pole of the second cell, from d to 
( 139 ) 
