The telegraph manual: a complete history and description of the semaphoric, electric and magnetic telegraphs of Europe, Asia, Africa, and America, ancient and modern.

104 VOLTAIC ELECTRICITY.
ders; p c the porous cup; c is the perforated copper chamber,
attached, and G is the glass tumbler. It is arranged upon the
Fig. 31.
principles of the Daniellbattery. A quantity current is generated by this combination ftlly equal to the requirements of the
local circuit. The peculiar form of the metallic parts, present
to the acidulated chemicals surface sufficient to produce the
desired results. This form of battery has been very extensively used, and with advantages worthy of appreciation.
INTENSITY AND QUANTITY OF THE GROVE, DANIELL, AND S.MEE
BATTERIES.
The following facts have been determined relative to the
comparative intensity and quantity powers of the Grove, Daniell
and Sinee batteries:
Intensity. Quantity.
Grove................... 87 Grove.....................4-4
Danie Daniell....................12
Smee, No. 1, open. 2........27 Smee, No. 1, open..........42
Smee, approximated plates...32 Smee, approximated plates..49
Thus, it appears, that nearly equal quantities of electricity
are excited by equal surfaces of Grove's and Smee's batteries,
but that the intensity of the nitric acid battery, is rather more
than three times that of Smee's. Daniell's arrangement holds
an intermediate position with regard to intensity, but is deficient in quantity.