^94 



SCIENCE. 



[Vol. XV. No. 379 



INDUSTRIAL NOTES. 



The Crocker-Wheeler Arc-Current Motor. 



The first ekclric motors placed ou the msrket by the Crocker- 

 Wlieeler Company were intended to be operated by a current of 

 constant potential and low tension, — what is usually termed "an 

 incandescent-light current." Those motors were described and 

 illustrated in these columns several months ago. Vvhile there is a 

 large and steadily widening field lor those constant i:olential mo- 



current or the load. The comm^itator and shaft bearings are 

 made sufficiently long to admit of this longitudinal movement, 

 which, besides its main function of varying the position of the 

 arvnature with regard to the pole-pieces, also distributes the wear 

 more uniformly ou brushes, armatui-e, and bfarings. 



Fig. 2 shows a novel application of a safety-cage or wire guard 

 to a fan driven by a Crocker Wheeler motor. This guard is in- 

 tended mainly to protect the fingers of children or meddlers from 

 the eflfect of contact with the rapidly revolving fan, we suppose. 



tors, and an increasing demand for them, there is also a field and 

 a demand for motors wound for higher tension and constant cur- 

 rent, to be operated on an arc-light cucuit. To meet this demand 

 the motor shown in Fig. 1 has been produced by the Crocker- 

 Wheeler Company. The regulation of this motor is effected in 

 the same way as in the same company's constant-potential motor; 

 namely, by causing tl>e armature to automatically move out of or 

 into the field, thereby keeping the amount of torque or magnetic 

 pull exactly proportionate to the work being done. The speed 

 is thus kept constant, no matter what the variation in the 



as we have observed that in cases of such contact the fan, like 

 the equally deceptive buzz-eaw, usually protects itself. An elec- 

 tric fan at full speed is cooling and comforting on a hot day, and 

 very pleasing to the eye, but it will npt bear handling. 



As an effect of the extraordinary demand for electric motors 

 produced by a better public appreciation of their merits, the 

 Crocker-Wheeler Company have been compelled to remove from 

 their former factory, which was by no means small, to a new lo- 

 cation,— probable the largest establishment of its kind in the 

 world. 



CALENDAR OF SOCIETIES. 



Biological Society, Washington. 



May 3.— Robert Reyburn, The Life-His- 

 tory of Micro-organisms with its Relation 

 to the Theory of Evolution ; George Vasey, 

 A New Grass Genus; W. H. Seaman, The 

 Place of Biology in Public School Instrac- 

 tion; F. A. Lucas, The Present Status of 

 Aurochs. 



New York Academy of Anthropology. 



May 6.— Edward C. Towne, The Physi- 

 ological Causes and Evolutionary Condi- 

 tions of Negro, Indian, and other Irrferior- 

 Raee Peculiarities (a paper especially de- 

 signed to present a scientific solution of the 

 negro problem) . 



May 13. — Lucy M. Hall, The Disposal of 

 the Dead. 



Appalachian Mountain Club, Boston. 

 May 9. — W. F. Dusseault, The White 

 Mountains of New Hampshire ; Exhibition 

 of a very fine collection of ster-eopticon 

 views, prepared by members of the Boston 

 Camera Club. 



Boston Society of Natural History. 



May 7, Election of Officers. — President, 

 r. W. Putnam; vice-pi-esidents, William 

 H. Niles, B. Joy Jeffries ; curator, Alpheus 

 Hyatt; honorary secretary, J, C. White; 



secretary, J. Walter Fewkes; treasurer, 

 Charles W. Scudder; librarian, J. Walter 

 Fewkes. 



J. A. Jeffries, Lamarckism, with an Ex- 

 ample; H. W. Haynes exhibited for G. 

 Frederick Wright the palaeolithic imple- 

 ment recently discovered by Mr. W. C. 

 Mills in the valley of the Tuscarawas, Ohio. 



CATARRH. 



Catarrhal Deafness— Hay Fever. 



A NEW HOME TREATMENT. 



Sufferers are not generally aware that these 

 diseases ave contagious, or that they are due to 

 the presence of living parasites in the lining 

 membrane of the nose and eustachian lubes. 

 Microscopic research, however, has proved this 

 to be a fact, and the result of this discovery is 

 that a simple remedy has been formulated where- 

 by catarrh, catarrhal deafness and hay fever are 

 permanently cured in from one to three simple 

 applications made at home by the patient once 

 in two weeks. 



N.B. — This treatment is not a snuff or an 

 ointment ; both have been discarded by repu- 

 table physicians as injurious. A pamphlet ex- 

 plaining this new treatment is sent free on 

 receipt of stamp to pay postage, by A. H. Dix- 

 on & Son, 337 and 339 West King Street. 

 Toronto, Canada. — Christian Advocate. 



Sufferers from Catarrhal troubles should care- 

 fully read the above. 



Exchanges. 



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

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

 York.l 



Wanted — To furnish roots of Dodecatheon Meadia^ 

 Sarracenia purpurea, ^nA other wild flowers, native of 

 Southern Wisconsin, in quantities. D. E. Willard, Cu- 

 rator of Museum, Albion Academy, Albion, Wis. 



A large number of plants from Maine, Connecticut, 

 Indiana and Illinois ior exchange. Southern and west- 

 ern exchanges preferred. Address, enclosing lists, L. N. 

 Johnson, 223 Chicago Ave., Evansto 



For Exchange — Fourteen volumes 

 annica (Stoddard's ninth edition), bo 

 in original wrappers, all as new — C3 

 volumes required to complete set, 

 "American Naturalist" in numbers 

 cutting foot lathe and testing galv 

 For particulars address A. B. C: 

 Bradford, Pa. 



I have a number of duplicates of microscopic slides, 

 mostly botanical, which 1 would like to exchange for 

 others not now in my collection. Send list of what you 

 have to exchange and get my list. S. R. Thompson, 

 New Wilmington, Pa. 



Correspmdence and exchanges solicited with persons 

 interested in the study of American and Mexican an- 

 tiquities. L. W. Gunckel, 36 Elm St., New Haven, Conn. 



n. 111. 



Encyclopedia Brit- 

 jnd in leather — part 

 n arrange to furnish 



Want small screw- 

 nd rheostat, 

 npbell, McKean Co., 



RUPTURE 



cured in stipulated time. 



NO DELAY FROM WORK. NO OPERATION. 



Call or send stamp for circular and reference of those 

 cured. We have on hand over 300 styles of trusses, from 

 $1 up, and suspensories of all kinds. Orders filled by 

 mail or express to any part of the United States. 



C. A. M. BURNHAM, M.D., 



138 Clinton Place, New York. 



