January 3, 1890.] 



SCIENCE. 



INDUSTRIAL NOTES. 

 A New Electrical Testing-Set. 



The great progress made in the applications of the electric cur- 

 rent to the service of man during the past few years has many 

 times multiplied the demand for accurate instruments for electrical 

 measurement. This demand has been readily supplied by the va- 

 rious makers of such instruments, who have kept pace with the 

 development in the electrical field in all directions. One result of 

 this increased demand has been a striving, on the part of the in- 

 strument-makers, to combine in one portable set all the various 

 devices needed by the working electrician in making the tests 

 called for at every stage of his work. The great economy in time, 

 trouble, and expense of such a compact testing-set will readily be 

 seen by all whose duty it may be to make electrical measure- 

 ments. 



A new testing-set of this kind has recently been brought out 

 by the electrical supply house of E. S. Greeley & Co. of this city. 

 It combines in one instrument a rheostat, bridge, galvanometer, 

 ■double contact key, and a dry battery of five chloride-of-silver cells. 

 The battery furnishes current enough to enable ordinary tests to be 

 made up to a resistance of or>e megohm. The galvanometer-needle, 

 which is of peculiar construction, is extremely sensitive, and will, 

 it is claimed, under ordinary circumstances, retain its sensitiveness 

 many jears. The pointer, which is made of aluminum, is long 

 enough to show a clear reading with the slightest movement of the 

 needle. 



The apparatus may be placed for use in any position, regardless 

 of the points of the compass, owing to the peculiar construction of 

 the galvanometer, which may be readily revolved to the left or 

 right for zero without altering the connections. In the bridge 

 there are three coils on each side, with a resistance of ten, a hun- 

 dred, and a thousand ohms respectively. There are four rows of 

 resistance coils in the rheostat, with ten coils in each row, giving 

 a range of measurement extending from yj^ of an ohm to i, 111,000 

 ■ohms. These instruments are all carefully adjusted in the labora- 

 tory, out of reach of disturbing electrical influences. 



The battery, though contained in the same case, is entirely dis- 

 tinct from the testing-set, so that any other battery may be sub- 

 ■stituted when more convenient for workshop or laboratory use. It 



is provided with flexible selecting cords, so that any number of 

 cells, from one to the whole battery, may be readily connected 



AN ELECTRICAL TESTING SET. 



with or disconnected from the instrument. The set 

 pact, and light, weighing only twelve pounds and a h 



is neat, com- 

 alf. 



Exchanges. 



[Free of cliarge to all, if of satisfactory character. 

 Address N. D. C. Hodges, 47 Lafayette Place, New 

 York.l 



Photographs and Stereoscopic views of Aborigines of 

 :any country, and fine landscapes.etc.,wanted in exchange 

 for minerals and fossils. — L. L. Lewis, Copenhagen, 

 New York. 



Droysen's Algeineiner Historichar Hutid-atlas (Leip- 

 -zig, iSSS.) for scientific books — tho-e published in the 

 Jnternatioital Scientific Scries preferred. -James H. 

 Stoller, Schenectady, N.Y. 



Astronomical works and reports wanted in exchange or 

 to buy. Reports of observations on the planet Neptune 

 and its satellile specially desired- — Edmund J. Sheri- 

 dan, B.A., 295 Adelphi St., Brooklyn, N.Y. 



I would like to correspond with any person having 

 Tryon's ''Structural and Systematic Conchology'' to 

 ■dispose of. I wish also to obtain State or tl.S. Reports 

 on Geology. Conchology, and Archseology. I will ex- 

 change classified specimens or p.iy cash. Also wanted a 

 copy of MacFarlane's *' Geologists' Traveling Hand-Book 

 and Geological Railway Guide." — D. E. Willard, Cura- 

 tor of Museum, Albion .Academy. Albion. Wis. 



Morris's " British Butterflies," Morris's " Nests and 

 Eggs of British Birds," Bree's " Birds of Europe" (all 

 colored plates), and other natural hisiorj', in exchange 

 ior Shakesperiana ; either books pamphlets, engravings, 

 or cuttings. — J. D. Barnett, Box 735. Stratford, Canada. 



I have Anodo'da o/>ahna (Weatherby), and many 

 -other species of shells frnm the noted Koshkonong Lake 

 and vicinity, also from Western New York, and fossils 

 from the Marcellus shale of New York, which 1 would be 

 glad to exchange for specimens of sci-mtific value of any 

 iind. I would also like to correspond with persons inter- 

 ested in the collection, sale, or exchange of Indian relics.— 

 D. E. Willard, .Albion Academy, .Albion, \Vis. 



Will exchange '• Princeton Review " for 18S3, Hugh 

 Miller's works on geology and other scientific works, for 

 "back numbers of " The Auk," "American Naturalist." 



r othe 



:ific periodicals or books. Write. — J. M. 

 , Ohio. 



Keck, Chardo 

 " I wish to exchange Lepidopicra with parti( 



for those found in other localities. 

 Volga, Brookings Co., Dakota. 



shells, curiosities or 

 W. F. Lerch, No. 308 East Fourth St., 



Shells and 

 minerals add 

 Davenport, Iowa. 



I want to correspond and exchange v 

 beetles in Texas or Florida. — Wm. 

 P.O. Box 223, Fredericksburg, Virginia, 



\ If you have a i 

 COLD or COUGH, i 



I acute or leadlns? to 



I COINS SUMPTION, 



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A New Method of Treating Disease. 



HOSPITAL REMEDIES. 



What are they? There is a new departure in 

 the treatment of disease. It consists in the 

 collection of the specifics used by noted special- 

 ists of Europe and .■Vmerica. and bringing them 

 within the reach of all. For instance, the treat- 

 ment pursued by special physicians who treat 

 indigestion, stomach and liver troubles only, 

 was obtained and prepared. The treatment of 

 olher physicians celebrated for curing catarrh 

 was procured, and so on till these incomparable 

 cures now include disease of the lungs, kidneys, 

 female weakness, rheumatism and nervous de- 

 bility. 



This new method of "one remedy for one 

 disease " must appeal to the common sense of 

 all sufferers, many of whom have experienced 

 the ill effects, and thoroughly realize the ab- 

 surdity of the claims of Patent Medicines which 

 are guaranteed to cure ever}- ill out of a single 

 bottle, and the use of which, as statistics prove, 

 /ins I tiiiieJ more stomachs than alcohol. A cir- 

 cular describing these new remedies is sent free 

 on receipt of stamp to pay postage by Hospital 

 Remedy Company, Toronto, Canada, sole pro- 

 prietors. ' 



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GEO. L. ENGLISH & CO., Dealers in Minerals. 

 1512 Chestnut St., I'hiladelphia, Pa. 



