Standard American cyclopedia of steam engineering; a treatise on the care and management of steam engines, boilers and dynamos .. by Swingle Calvin Franklin 1846-

Author:Swingle, Calvin Franklin, 1846- [from old catalog]
Language: eng
Format: epub, pdf
Tags: Steam engineering
Publisher: Chicago, Ill., Printed by F. J. Drake & co.
Published: 1915-03-25T05:00:00+00:00

wash them in clean water, and then dip in a bath of water containing a very small amount of sulphuric acid to prevent oxidization, dry them and carefully weigh them again. It will be found that the negative plate has increased in weight by what is called electrolytic action. Now weigh the negative plate and ascertain the exact number of grammes of copper deposited on its surface, or, in other words, find how many grammes heavier the plate is now than it was before it went into the bath. With these data in our possession we will multiply the time in seconds that current was passing through the plates by .000329 and divide the number of grammes deposited on the plate by the result. The quotient will be the number of amperes that passed from plate to plate. This I give simply to show you the manner in which the ampere can be ascertained. It is that current which will deposit .000329 gramme per second on one of the plates of a voltameter, as above described. It is also the current produced by one volt acting through a resistance of one ohm.

In other words, the ampere is that current which would be forced over a wire having a resistance of one ohm by a pressure of one volt.

The ampere-hour is the unit of electrical quantity in general use. It is the quantity of electricity conveyed by one ampere flowing for one hour, or one-half ampere flowing for two hours; or again, one-fourth ampere flowing for four hours. In each case the sum total would be one ampere-hour. It must, however, be noted that an ampere-hour with the pressure at no volts would deliver just one-half as much power as an ampere-hour at 220 volts.

An ordinary 16 candle-power no volt incandescent lamp requires a current of about one-half an ampere.

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