TRANSACTIONS OF THE SECTIONS. 
23 
The Battery. The magnet designated above as No. 2. was tried 
with a battery: 
lb. o z. 
No. 1. Double cell, each 1 foot square ; power. 1111 
2. - 1 foot by 6 inches. 6 11 
3. Single cell, 3 inches by 24 - . 0 8 
4. - 1 inch square. 0 2 
Same magnet with single cell of battery No. 2, and charged with 
No. 1. 1 part sulphuric acid, 50 parts water ; power.... 5 0 
2. 1 -nitric acid, 50- .... 3 8 
The spark with these charges was at first very brilliant, but the 
effect was transitory. 
No. 3. Diluted alcohol, 10 parts in 100 ; power. 0 4 
4. 2 parts sulph. acid, 1 nitric acid, 100 water .... 11 10 
5. 1 part- 2 - 100 - .... 4 0 
No. 4. was tried with a helix interposed between the po¬ 
sitive pole of the battery and the magnet. The lifting 
power was. 1 0 
Another magnet being interposed, power . 3 0 
When No. 4 was exhausted, so that it would lift only 1 
pound, its zinc plate was raised out of the fluid and re¬ 
placed ; this increased the power to . 2 8 
When No. 4 would lift only 1 pound its fluid was poured 
into its other cell, and the power became . 5 9 
8 pairs of plates in Cruikshank’s battery caused magnet 
No. 4 to lift . 5 8 
A calorimotor of equal surface, charged with a similar fluid 11 10 
Perhaps the increased tension of the electricity might be found of 
advantage when the helix is of great length. 
In speaking of the charge, the author remarks that he is fully 
persuaded of the necessity of decomposition for the production of 
galvanic effect. A deflexion of 15° and more has been produced 
in a galvanometer of great delicacy, which he constructed by merely 
uniting, by a single corner of each, two tarnished pieces of metal, the 
one zinc, the other copper; the imperceptible perspiration of the hand 
may have acted as a fluid, and some foreign substance deposited on 
either or both metals have aided the decomposition. 
The Helix. Four magnets with different helices were used with 
the same battery. 
Magnet No. 1. 8 inches long, -§- diam., coil 7 % yards, power 11 0 
2. —--- 4 - -- 6 0 
3. That with knobs already mentioned, coiled 
with 7-f yards of wire . 2 5 
Coiled with ribbon of copper on the knobs .. 0 2 
Five magnets, each 8 inches long and -§- diameter, were coiled 
