File:Factory and industrial management (1891) (14779246544).jpg

Identifier: factoryindustria35newy (find matches)
Title: Factory and industrial management
Year: 1891 (1890s)
Authors:
Subjects: Engineering Factory management Industrial efficiency
Publisher: New York (etc.) McGraw-Hill (etc.)
Contributing Library: Engineering - University of Toronto
Digitizing Sponsor: University of Toronto

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
andless easily at-tacked by acid.The Gould plateis all lead with-out alloy. It may be well to state that although sponge lead and pure leadare apparently the same chemically, they do not act in the same way,as the pure lead is hardly affected by the passage of electric currentfrom one plate to another, while the sponge lead is at once oxidized.It is this fact that makes it necessary in the first manufacture of theactive material on the plates to do the preliminary oxidization of theplates by some acid such as nitric acid, and it is of the greatest im-portance that this acid be entirely removed before the plates are putinto service, or the process of forming, i. e., oxidation, will go onuntil the plates are destroyed. The life of the plates, which are the only perishable parts of thebattery (except for minor matters, such as separators and acid), de-pends almost wholly on the number of charges and discharges, i. e.,the amount of oxidization which has taken place. The oxidization, like
Text Appearing After Image:
FIG. 12. CELL AND PLATES, GENERAL STORAGE BATTERY CO. STORAGE BATTERIES. 855 the rusting of iron, is progressive; first the outer layer, then deeperand deeper until the whole of the available material, whether corru-gated ribbon, grid, or leaf, is oxidized. As regards this progressiverusting, there are two theories; the one advocates arrangement toallow dropping off of the particles as new oxide forms, the otheradvocates the holding of as much oxide as possible with the idea thatthe capacity depends on the quantity of material, and the more oxidethe more capacity. The latter theory seems the better grounded, as itis well known that the capacity of the negative plates decreases be-cause of the gradual falling off of the active material, and as theoxidization is not progressive on these plates, due to the continuedde-rusting on discharge, the capacity of the negative plates decreases.The falling off of the active material results in a deposit in thebottom of the jar or tanks, which must

Note About Images