19^ 



SCIENCE. 



[Vol. XVII. No. 426 



INDUSTRIAL NOTES. 

 The Crocker-Wheeler Motors. 



The Crocker-Wheeler Electric Motor Company of this city are 

 BOW turning out a line of motors which, in point of excellence, 

 both mechanically and electrically, leave little to be desired in the 

 present stage of electrical development. These motors are so de- 

 signed and constructed that they do their rated worli at a much 

 slower speed than has been possible heretofore, and without the 

 hitches and troubles frequently incident to the use of electrical 

 machinery. 



In the accompanying illustrations. Fig. 1 is a skeleton view 

 showing the construction of a motor of small size, one-horse- 

 power and under. Figs. 2 and 3 show an indestructible resist- 

 ance-bos, made entirely of iron and slate, and used in starting, 

 stopping, and regulating the speed of the motors. 



The field-magnets are composed entirely of wrought iron, each 

 being forged in a single piece and set deeply into the base, in- 

 suring ample magnetic contact, together with great solidity of 

 construction. 



The space for wire on the magnets is perfectly cylindrical, 

 thereby insuring smooth and perfect winding of the wire, and is 

 short in length, permitting the shaft of the machine to be low 

 enough to free it from vibration. By this construction, the neu- 

 trality or freedom of the base from magnetism is secured, and 

 there is no tendency to leakage, making the machine superior in 

 this respect to those in which the base is made to serve as one of 

 the pole-pieces. 



The armatures contain several improvements. They are sufB- 



ciently large in diameter to obtain slow speed, and are so designed 

 that the wire winding is entirely embedded below the surface of 



the iron core, thus protecting it from injury, holding it rigidly in 

 position, and rendering it possible for the magnets to approach 

 very closely to the core, so that an intense magnetic effect is pro- 



Publications : 



red at Editor's Offic 

 ch 9-28. 



Arkansas, Annual Report of the Geological Surrey 

 of for 1889. Vol. II. The Geology of Crowley's 

 Bidge, by E. Ellsworth Call. Little Rock, Wood- 

 ruff Pr. Co. 283 p. 8°. 



CuLiN S Chinese Games with Dice. Philadelphia, 

 The Author. 1889. 21 p. 8°. 



The I'Hing or "Patriotic Rising." Chinese 



Secret Societies In the U. S. Customs of the 

 Chinese in America. Philadelphia, The Author, 

 22 p. 8°. 



GKiBATiPOFP, V. The French Invasion of Ireland 

 in '98. New York, Truth Seeker Co. 193 p. 12°. 

 $150. 



Hagerup, a. T. The Birds of Greenland. Tr. by 

 P B Amgrimson. Boston, Little, Brown, & Co., 

 62 p. S". $1. 



Hans Andersen's Stories. Newly translated. Part 

 I (Riverside Literature Series. No. 49.) Boston 

 and New York, Houghton, Mifflin, & Co. 96 p. 

 16°. 15 cents. 



Hatch, P. H. An Introdtction to the Study of 

 Petrology : The Igneous Rocks. London, Swan 

 Sonnenschein & Co. ; New York, Macmillan. 128 

 p. 12°. 9u cents. 



HoFFDiNG, H. Outlines of Psychology. Tr. by Mary 

 B. Lowndes. London and Now York, Macmillan. 

 365 p. 12°. S).50. 



LcDLOw, H. U., and Bass. B. W. Elements of Trig- 

 onometry. 3ded. New York, Wiley. 294 p. 8°. 

 S3. 



National Guard, The. Vol. I. No. 1. m. Washing- 

 ton, J. H. Polkinhorn. IB p. f°. $3 per year. 



Sloane, T. O'C. Rubber Hand Stamps and the 

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 Henley & Co. 140 p. 12°. $1. 

 Truth Seeker Annual and Freethinkers' Almanac, 

 The, 1891, No, 1, January, m. New York, Truth 

 Seeker Co. 114 p. 8°. S3 per year. 



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AMERICAN GEOLOGIST FOR 1891 



AND 



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Publications of the University of Pennsylvania. 



SERIES IN 



Philology, Literature and 

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Vol. I. now ready. 



1. Poetic and Verse Criticism of the Reign of Eliza- 



beth. By Felix E Schelling, A.M.. Assistant 

 Professor of English Literature. SI. 00. 



2. A Fragment of the Babylonian '• Dibbarra'' Epic. 

 By Morris Jastrow, Jr., Ph.D., Professor of 

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3. a. Upog with the Accusative, b. Note on a Pas 

 sage in the Antigone. By William A. Lamberton, 

 A.M., Professor of the Greek Language and Lit- 

 erature. 50 cents. 



4. The Gambling Games of the Chinese in America. 

 Ffi.n tan and PAk k6p piu. By Stewart Culin, 

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In preparation . 

 The Terrace at Persepolis. By Morton W. Easton. 



Ph.D.. Professor of Comparative Philology. 

 An Aztec Manuscript. By Daniel G. Brinton. M.D., 



Professor of American Archeology and Linguis- 

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 A Monograph on the Tempest. By Horace Howard 



Furness. Ph.D., LL.D. 

 Recent Archaeological Explorations in New Jersey. 



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 A Hebrew Bowl Inscription. By Morris Jastrow, 



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English Literature, 

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