Image from page 614 of “Electrical world” (1883)

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Image from page 614 of “Electrical world” (1883)
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Identifier: electricalworld43newy
Title: Electrical world
Year: 1883 (1880s)
Authors:
Subjects: Electrical engineering
Publisher: [New York McGraw-Hill Pub. Co., etc.]
Contributing Library: Engineering – University of Toronto
Digitizing Sponsor: University of Toronto

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n Figs. 15 to 17 these strains are still higher as b is to be replacedby the larger value, b and 2 in the denominator by 1.5 or i. These examples may be sufficient to give an idea of the excessivestrains which exist in high-speed field bodies. 4. Finally a few words about noiseless running. It is generallyknown that all extra high-speed machines have a certain tendencyto produce a penetrating, shrill or droning noise, which renders everyconversation impossible, and which may be heard over a great dis-tance. The cause is the very rapid air movement, especially thewhirls and sudden variations of the section of the streaming air byprojecting and overhanging windings or other parts of the generator.Bars insufficiently fixed in the slots or laminated teeth not well 598 ELECTRICAL WORLD and ENGINEER. Vol. XLIII, No. 13. pressed together may magnify the noise considerably. The bestremedy consists in designing an absolutely smooth drum or rotating The Letter of Peregrinus on the Magnet, 1269.

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FIG. 18.—GENER.L ELECTRIC METHOD OF COMBINING POLES .XD POLESHOES. part which can easily be done for the types of Figs. 9 and 10. Definitepole types have to be very often to be entirely closed by cylindrical

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Image from page 727 of “Gleanings in bee culture” (1874)
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Identifier: gleaningsinbeecu35medi
Title: Gleanings in bee culture
Year: 1874 (1870s)
Authors:
Subjects: Bees Bee culture
Publisher: [Medina, Ohio, A. I. Root Co.]
Contributing Library: UMass Amherst Libraries
Digitizing Sponsor: UMass Amherst Libraries

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my surpxise anddismay on finding that the queen and beeshad taken French leave, or swarmed out.The bees had started to build some comb inthe frame that was partly built out, and thequeen had laid a few eggs, but probably shewas not sufficiently fertilized, and tried togo out and find some drones; but there werenone around there. I think I was foolish fornot clipping her wing. Deerwood, Minn. G. H. Peterson. [Ordinarily the bees would have stayed allright without swarming out; but it wouldhave been better to clip the queens wing,and, in addition, given the bees a frame ofunsealed brood. —Ed.J AN AUTOMATIC SWARM-CATCHEK. I send you a drawing of an automaticswarm-catcher, of which I desire your opin-ion as to whether it would be practical andefficient. The tube and cage are made offine wire screen, which prevents the beesfrom killing the queen on finding that shecan not leave with them, and the rest is madeof perforated zinc. William Bacon. Burt, Iowa. Libera ting Sl idbI ClUEEN Cag£

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[Your plan would probably catch theswarm; but a far cheaper plan would be anAlley trap. Bees very seldom if ever kill aqueen in an Alley trap. After making oneor more fruitless attempts to swarm theymay supersede her in the hive. Your devicewould be no better than the Alley trap, andcost more.—Ed.] PAINT for hives MADE OF OIL AND PORT-LAND CEMENT. I paint the covers of my hives too, withthree coats of boiled oil and Portland cement.It hardens like stone, and the covers do notleak. I have some covers and hives that werepainted this way 13 years ago, and they aregood to-day. Mix like paint. The last coat is sprinkledwith cement. Rub it in with the hands. TuUy, N. Y. J. W. Tufft. [Such paint is excellent, as we know fromtests.—Ed.] A question CONCERNING INCREASE. Does it set a strong colony working .wellin supers now to take two frames of hatchedbrood from them and give full sheets of foun-dation in return, the same brood being usedfor increase? Would you advise me to takeone colony

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Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability – coloration and appearance of these illustrations may not perfectly resemble the original work.

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