Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 83
thin lessthan 1% ; and as the square root of the pull is taken, the final error becomesquite small, especially with high readings. The evaluation of the results for the above permeameter are obtained bythe use of the following formula : — .70 MAGNETIC PROPERTIES OF IRON. Where % = number of turns… … The number of lines of force per square centimetre,(B = 1,317 y/^ + OC- Where P = pull in lbs. A = area of the sample in square inches = 0.3068.^fC^ value of the magnetizing force for the given pull. THE PEEMEAMETER. fl Substituting the value of A in the above formula we have (£=:2,3S0Vp + 3e.…
Electrical engineering
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