TRANSCRIBER'S NOTE:
In transcribing this book, the proofreaders found and corrected severalminor typographical errors which did not affect the sense of the text.In the caption to Figure 541, the equation for the voltage of a Weston cellat different temperatures was missing a digit "1" and this has beencorrected. There is a reference to a Figure 619 but no such figure existsin the original text. There are references to a Figure 119 and a Figure 443;these presumably exist in one of the preceding volumes of the series.
HAWKINS
ELECTRICAL GUIDE
NUMBER THREE
ANSWERS
&
ILLUSTRATIONS
FOR ENGINEERS, ELECTRICIANS, STUDENTS
AND THOSE DESIRING TO ACQUIRE A
WORKING KNOWLEDGE OF
BY
HAWKINS AND STAFF
COPYRIGHTED, 1914,
BY
THEO. AUDEL & CO.,
New York.
Printed in the United States.
TABLE OF CONTENTS
GUIDE NO. 3.
Action of compass needle--simple galvanometer--differencebetween galvanoscope and galvanometer--sensibility--actionof short and long coil galvanometers--classesof galvanometer--astatic galvanometer--tangentgalvanometer--graduation of tangent galvanometerscale--table of galvanometer constants--mechanical explanationof tangent law--sine galvanometer--table ofnatural sines and tangents--comparison of sine and tangentgalvanometers--differential galvanometer--ballistic galvanometer--kick--dampingeffect--use of mirrors ingalvanometers--lamp and scale--damping--D'Arsonvalgalvanometer: construction, operation; uses--galvanometerconstant or figure of merit--shunts.
TESTING AND TESTING APPARATUS 465 to 536
Pressure measurement--Clark cell--Weston cadmiumcell--pressure measurement error with ordinary voltmeter--Internationalvolt--hydraulic analogy of amperes--coulombs--currentmeasurement--International ampere--voltameters--Ohm'slaw and the ohm--Internationalohm--ohm table--practical standards of resistance--variousmethods of resistance measurement--directdeflection method--method of substitution--resistancebox--fall of potential method--differential galvanometermethod--drop method--voltmeter method--Wheatstonebridge--usual arrangement of resistances of Wheatstonebridge--ratio coils of Wheatstone bridge--the decadeplan--two plug arrangement--"plug out" and"plug in" type of resistance box--testing sets--directdeflection method with Queen Acme set--[typo:ohmeter:ohmmeter]--fallof potential metho