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RECF..XT ])EV>~'r.OP.~*~'×J'S ~× S'rE.\5~ TUR~X~:S. 32.7 materially facilitate the accuracy and reliability of operation. An experimental marine turbine and reduction gear has just been erected at the plant of The \'Vestinghouse Machine Com- pany which embodies all features incidental to the recent developments in the Westinghouse marine turbine and reduction gear and the bridge control apparatus. It is believed that this machine will be in operation and open to inspection to those interested in the matter in the course of thirty days. after whicb time there will doubtless be a thorough technical description of the new features involved. The thanks of the author are due to The Westinghouse Machine Company for the preparation of the illustrations, to the text-book on steam turbines by Professor Moyer, from which Fig. 17 is taken, and whose outline of the elementary principles of blading has been more or less followed, and to Mr. K. Ban- mann, of the British Westinghouse Company, from whose paper have been taken ahnost entirely the correction tables compiled in Appendix III. (To be contimtcd by .ippelldices I, lI, and IIZ.) Cause of Dark-colored Nickel Deposits. Axox. (Brass llTorld, ix, I, 27.)--There are several causes of a (lark nickel deposit. (I) From too strong current. (2) From the solution becoming alkaline. The articles, if they are of such a shape as to have pockets, carry potash or soda from the cleaning kettle into the nickel-plating bath, if they are not thoroughly removed by rinsing. (3) Stoppage of current. (4) Copper in the nickel solutio,n. arising from articles falling to the bottom of the tank, or from copper in the nickel anodes, or from the copper-plating solution left on the articles to be nickel-plated. (5) Zinc in the nickel ~olution. (6) Arsenic from impure ~ickel. The solution should ahvays be slightly acidified with boric acid. Volcanic Dust in the Atmosphere. AxoN. (Sci. AmcG evii, No. 23, 477.)--Reports of an unusual turbi(litv of the atmosphere, beginning early last summer, come from various points in Europe and America. There is a marked diminution of the intensity of solar radiation, abnormal displacement of the neutral points of atmospheric polarization, a hazy appearance of the sky, and the presence of ]3ishop's ring around the sun. There seems reason to attribute these phenomena to the presence in the upper atmosphere of an immense pall of dust arising from the explosive eruption of Katmai volcano, in Alaska, last june.

Cause of dark-colored nickel deposits

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Page 1: Cause of dark-colored nickel deposits

RECF..XT ])EV>~'r.OP.~*~'×J'S ~× S'rE.\5~ TUR~X~:S. 32.7

materially facilitate the accuracy and reliability of operation. An experimental marine turbine and reduction gear has just been erected at the plant of The \'Vestinghouse Machine Com- pany which embodies all features incidental to the recent developments in the Westinghouse marine turbine and reduction gear and the bridge control apparatus. It is believed that this machine will be in operation and open to inspection to those interested in the matter in the course of thirty days. after whicb time there will doubtless be a thorough technical description of the new features involved.

The thanks of the author are due to The Westinghouse Machine Company for the preparation of the illustrations, to the text-book on steam turbines by Professor Moyer, from which Fig. 17 is taken, and whose outline of the elementary principles of blading has been more or less followed, and to Mr. K. Ban- mann, of the British Westinghouse Company, from whose paper have been taken ahnost entirely the correction tables compiled in Appendix III.

(To be contimtcd by .ippelldices I, lI, and IIZ.)

Cause of Dark-colored Nickel Deposits. Axox. (Brass llTorld, ix, I, 27.)--There are several causes of a (lark nickel deposit. (I) From too strong current. (2) From the solution becoming alkaline. The articles, if they are of such a shape as to have pockets, carry potash or soda from the cleaning kettle into the nickel-plating bath, if they are not thoroughly removed by rinsing. (3) Stoppage of current. (4) Copper in the nickel solutio,n. arising from articles falling to the bottom of the tank, or from copper in the nickel anodes, or from the copper-plating solution left on the articles to be nickel-plated. (5) Zinc in the nickel ~olution. (6) Arsenic from impure ~ickel. The solution should ahvays be slightly acidified with boric acid.

Volcanic Dust in the Atmosphere. AxoN. (Sci. A m c G evii, No. 23, 477.)--Reports of an unusual turbi(litv of the atmosphere, beginning early last summer, come from various points in Europe and America. There is a marked diminution of the intensity of solar radiation, abnormal displacement of the neutral points of atmospheric polarization, a hazy appearance of the sky, and the presence of ]3ishop's ring around the sun. There seems reason to attribute these phenomena to the presence in the upper atmosphere of an immense pall of dust arising from the explosive eruption of Katmai volcano, in Alaska, last june.