. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . 21 shows in section the (loublc tubular magnets of the Thomson-Houston dynamo, thespherical arnuiture being placed, as in Nos. 12, 14. and 15. between two poles. Thereis a curious analogy between Nos. 21 and 19; but, they differ entirely in the position of tliecoils. No. 22 is a design by Kajjp, in which there are two salient jiolcs of similar polarity,and two consofjuent poles between them, one pair
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . 21 shows in section the (loublc tubular magnets of the Thomson-Houston dynamo, thespherical arnuiture being placed, as in Nos. 12, 14. and 15. between two poles. Thereis a curious analogy between Nos. 21 and 19; but, they differ entirely in the position of tliecoils. No. 22 is a design by Kajjp, in which there are two salient jiolcs of similar polarity,and two consofjuent poles between them, one pair of coils sullicing to magnetize the wholequadruple circuit. Almost identical forms liave l)een employed by Kennedy ( iron-clad dynamo), and l)y Tjahnu^yer ami by Wenslnim. No. 2:! (Iig- b!) is a type which, used longago by Sawyer and by liontin, has recently become ii favorite one, having been revived almostsimultaneously by (iramme (type superieur). by Kapp, by Siemens (•? F type), by Caiiella( Technomasio ). and lately by Iaterson and Cooper. No. 24 is i{rf)wns very massive 25 is a design by Kennedy, known as the iron-clad dyiuimo ; the iron cores are forged. Fig. 14.—Field-magnets. DYNAMO-ELECTRIC MACHINES. 205 to shape. No. 26 is designed by Prof. George Forbes. The iron-work is in two halves ; thecoils, which are entirely inclosed, are so placed as to magnetize the armature directly, onecoil occupying all the available space between the field-magnet and the upper half of thearmature, the other the similar space around the other half. No. 27 is the 4-pole formadopted by Elwell and Parker in some of their larger machines. No. 28 is a multipolar formused by Wilde, Gramme, and others, the poles which surround the ring being alternately ofopposite sign. In No. 29, a modification of this design by Thury, for use with a drum-arma-ture, the six inwardly directed poles axe magnetized by coils wound upon the external hex-agonal frame. No. 30 is a sketch of the latest f
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
