. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . was built for 400 revolutions per min., and weighed 7,100 lbs. : in the test itwas run at 330 revolutions: Cnrrent, unfkm. I E. M. F., volU. Horse-power. Dynamometer,horse-power. Loss. Losses, frictionreversals. C2 R. EfUciency,per ceut. 134-81941371-6400 114115-698-3110 20-63014958-9 24-9735-354-564-7 445-25-55-8 4-44-53-54-1 0170-52]-301-50 82-585-289-991 The Bradley 3IuUipolar Dynamo.—The armature of this machine
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . was built for 400 revolutions per min., and weighed 7,100 lbs. : in the test itwas run at 330 revolutions: Cnrrent, unfkm. I E. M. F., volU. Horse-power. Dynamometer,horse-power. Loss. Losses, frictionreversals. C2 R. EfUciency,per ceut. 134-81941371-6400 114115-698-3110 20-63014958-9 24-9735-354-564-7 445-25-55-8 4-44-53-54-1 0170-52]-301-50 82-585-289-991 The Bradley 3IuUipolar Dynamo.—The armature of this machine has the conductorswound upon it in one continuous course, so that the distance between each two successiveinduced portions of the conductors is greater or less than that between the poles of the field-magnets, according to the formula : n n D = d ; or. 7; = d. P P The inchiced current flows from one brush to the other through the whole svstem of con-ductors in such manner that, however simple or complex the system of conductors may be the average value of the dis-tance (/ between every two in-duced parts which follow nextto one another always con-forms to the condition,. p\ n ) where u = average circumfer-ence of armature, n = num-ber of segments of the collec-tor, p = any number of field-magnets not than four. In the machine shown inthe engraving (Fig. 75) therearc 74 slots cut in the arma-ture 11\; in. tleep, ,Vu-o •>• wideat the circumference, andiWiT in- wide at the leaves the iron the samethickness between the slots atthe bottom as at the top, theaim being in these machinesto have the magnetic circuitthe same in cross-section inall its parts. The sectional area of the yokes, cores of the magnets, and the sum of (lions of the bodies of iron between the slots which arc under the pole-pieces at anyone time, are approximately equal. Two Imrs are placed in each slot, the top one beinglonger than the bottom one, so as to project beyond i
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
