Miscellanies. 189 
The magnets I now have in use, are one inch in diameter, one inch 
and three quarters between the poles, and five inches and a half in 
length, each wrapped with one hundred and fifty feet of iron (bonnet) 
wire. My battery is rectangular, and consists of two concentric boxes 
of sheet copper, with a zinc box included, the whole constituting a 
square box open in the middle. ‘The exterior box is seven inches 
square, the zinc seven deep by six and a half in each of its other di- 
mensions, the interior box of copper seven by six ; the whole will . 
contain something more than a quart of the acid menstruum, and pre- 
sents about two-fifths of galvanic surface in the aggregate. ‘The dri- 
ving or band-wheel is sixteen.inches in diameter, (the discs being nine 
inches each,) the shaft of iron three-eighths of inch thick and five 
inches long, working im brass bearings. ‘The battery is charged 
through a cock in the platform, (which is of cherry, one inch thick by 
twelve square, and is attached to the battery by screw-bolts,) and 
discharged when necessary to cleanse or replenish, by a cock near 
the bottom. The whole swung in gimbals between two turned 
posts, communicates motion from the band through the platform and 
center of the battery to the propelling wheel, on the axle of a 
small carriage. The driving wheel revolves when not loaded, 
(sixteen inches diameter) about two hundred times in a minute, 
traversing upwards of eight hundred feet! and will revolve seventy. 
times per minute, carrying a load of forty pounds, through a space 
of two hundred and eighty feet, in that time, being a performance 
nearly equal to the power of three men. ‘The entire machine occu- 
pies a space of two feet in height by a foot in breadth, and weighs, 
when charged for service, seventeen pounds. ‘Touching a small 
lever reverses the action of the engine instantaneously ; raising an- 
other arrests its action, or technically, throws it out of gear. Thus, 
sir, as you will perceive, my engine differs totally from the ingenious ar- 
rangement of Messrs. Davenport & Cooke, of whose galvanic machine 
your April number contained a notice. Justice to myself, without 
intending to depreciate in any degree the labors of others, requires 
from me the statement that my engine, as zt stands, substantially, 
was in existence nearly two years since, the greater part having been 
made to my order by the mechanics of this village, in the summer 
of 1835; an improved portion of the moving parts (of finished 
workmanship) was made in Philadelphia, as long since as January 
of the present year, by Mr. J. Mason, philosophical imstrument- 
maker, of Greenleaf’s court. I may also state, that Professor Hare, 
