This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 edition. Excerpt: ... not be too great to prevent the current's reaching their steady values between two consecutive reversals of the battery. That this condition is fulfilled may be ascertained by seeing whether the same value for L is obtained for a much smaller speed than the highest used. In Fig. 87 the galvanometer ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 edition. Excerpt: ... not be too great to prevent the current's reaching their steady values between two consecutive reversals of the battery. That this condition is fulfilled may be ascertained by seeing whether the same value for L is obtained for a much smaller speed than the highest used. In Fig. 87 the galvanometer and battery commutators are represented symbolically by G.c. and B.C. respectively. O bservations.--(1) Connect up the requisite apparatus as represented in Fig. 87, the motor circuit not being shown, and adjust the galvanometer to zero. (2) Assuming / to be roughly known, make P = Q = about this resistance, if possible. Fig. 87. (3) Remove "infinity" plug in S, and adjust R so that on closing the battery circuit, first by, if necessary, slightly turning the commutators into a different position for contact, and then closing the auxiliary key K a second or two after, it is just too large to give no deflection on G. (4) Reinsert "infinity" plug in S, and making S much larger than R, adjust it so as to finally "balance the bridge " accurately for steady currents in the usual way by closing K last. (5) Drive the secohmmeter at a low constant speed, N revolutions per minute by the motor, say, and note the constant deflection d scale-divisions on the galvanometer G. (6) Stop the secohmmeter, and throw out the balance for steady currents obtained in (4) above by increasing S, thereby increasing the resistance of the arm ad by a small' amount p, and note the steady deflection D scale-divisions of G. (7) Repeat (5) and (6) alternately a few times, in order to eliminate any error due to the variation of the battery E.M.F., and take the mean of the two sets of values of d and D respectively. (8) Repeat (3H7), first by...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
All Editions of Practical Electrical Testing in Physics and Electrical Engineering; Being a Course Suitable for First and Second Year Students and Others
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