3o8 



SCIENCE. 



[Vol. XXI. No. 539 



THE 



M Te 



COMPANY. 

 128 MILK ST„ BOSTOll, MASS, 



This Company owns the Letters - Patent 

 No. 186,787, granted to Alexander Graham 

 Bell, January 30th. 1877, the scope of which 

 has been defined by the Supreme Court of 

 the United States in the following terms: 



' ' The patent itself is for the mechanical 

 structure of an electric telephone to be used 

 to produce the electrical action on which the 

 first patent rests. The third claim is for the 

 use in such instruments of a diaphragm, 

 made of a plate of iron or steel, or other ma- 

 terial capabla of inductive action ; the fifth, 

 of a permanent magnet constructed as de- 

 scribed with a coil upon the end or ends 

 nearest the plate ; the sixth, of a sounding 

 box as described ; the seventh, of a speaking 

 or hearing tube as described for conveying 

 the sounds ; and the eighth, of a permanent 

 magnet and plate combined. The claim is 

 not for these several things in and of them- 

 selves, but for an electric telephone in the 

 construction of which these things or any of 

 them are used." 



This Company also owns Letters-Patent 

 No. 463,569, granted to Emile Berliner, No- 

 vember 17, 1891, for a combined Telegraph 

 and Telephone, and controls Letters-Patent 

 No. 474,231, granted to Thomas A. Edison, 

 May 3, 1892, for a Speaking Telegraph, 

 which cover fundamental inventions and 

 embrace all forms of microphone transmit- 

 ters and of carbon telephones. 



BUSINESS OPPORTUNITY. 



There is an opening for a 

 young man to open a New 

 York office of the American 

 Lightning Protection Co., 

 operating under my patents. 

 But little capital will be re- 

 quired. 



N. D. C. HODGES, 



874 BROADWAY, NE W YORK 



_ ASK us(; 



-^-c-We make tmem. 



— C J. B.COLT & CO. ^ 



I6BEEKMAN ST. 17 189 LA SALLE ST. 



NEW YORK 



CHICACO.Ill 



MINERALS. 



New Store. 

 New Stock. 

 New Departments. 



Send for our " Winter Bulletin," recently issued. 

 Minerals, Gems, Microscopical Sections, Fine Lap- 

 idary "Work. 



GEO. L, ENGLISH & CO., Mineralogists, 



Removed to 64 East 12th Street, New York, 



LIGHTNING DESTROYS! 



Shall it be your house or a 

 pound of copper ? 



Entirely new departure in pro- 

 tecting buildings from lightning. 

 One hundred feet of the H odges 

 Patent Lightning Dispeller 

 (made under patents of N. D. C. 

 Hodges, Editor of Science) will 

 be sent, prepaid, to any ad- 

 dress, on receipt of five dollars. 



Correspondence solicited. Agents wanted. 



AMERICAN LIGHTNING PROTECTION CO., 



874 Broadwfay, New York City. 



Fact and Theory Papers 



I. THE SUPPRESSION OF CON- 

 SUMPTION. By GODFBET W. Hambleton, M.D. 



ia°. 40c. 



II. THE SOCIETY AND THE " FAD." 



By Apfleton Morgan, Esq. 12°. 20 cents. 



III. PROTOPLASM AND LIFE By 

 C. P. cox. 13°. 75 cents. 



IV. THE CHEROKEES IN PRE-CO- 



LUMBIAN TIMES. By CTKUS THOMAS. 13°. $1. 



V. THE TORNADO. By H. A. Hazen. 



12°. $1. 



VI. TIME-RELATIONS OF MENTAL 



PHENOMENA. By JOSEPH JASTROW. 12°. 50c. 



VII. HOUSEHOLD HYGIENE. By 



Mary Taylor Bissell. 12°. 75 cents. 



N. D. C. HODGES, Publisher, 



874 Broadway, New York. 



QUERY. 



Can any reader of Science cite 

 a case of lightning stroke in 

 which the dissipation of a small 

 conductor (one-sixteenth of an 

 inch in diameter, say,) has failed 

 to protect between two horizon- 

 tal planes passing through its 

 upper and lower ends respective- 

 ly? Plenty of cases have been 

 found which show that when the 

 conductor is dissipated the build- 

 ing is not injured to the extent 

 explained (for many of these see 

 volumes of Philosophical Trans- 

 actions at the time when light- 

 ning was attracting the attention 

 of the Royal Society), but not 

 an exception is yet known, al 

 though this query has been pub- 

 lished far and wide among elec- 

 tricians. 



First inserted June 19, 1891. No re- 

 sponse to date. 



N. D. C. 



, 874 BROADWAY, N. Y. 



SCIENCE CLUBBING RATES. 



10^ DISCOUNT. 



We will allow the above discount to any 

 subscriber to Science who will send us an 

 order for periodicals exceeding $10, counting 

 each at its full price. 



N. D. C. HODGES, 874 Broadway, N. Y. 



"BUSY FOLKS' GYMNASIUn." 



afcr: 



A few minutes' daily exercise 

 on our fascinating apparatus 

 clears the brain, tones up the 

 body, develops weak parts. Our 

 cabinet contains chest- weights, 

 rowing- weights, lifting- weights, 

 clubs and dumb bells, adjust- 

 able for old and young. // is 

 the only complete exercising outfit 

 in the 7vorld suitable for use in 

 _' living rooms. All prices. You 

 can order on approval. Chest 

 ''^^j'^^^^^^ machine separate, $4.50 and up. good for Round shoulders. 

 S^ Educated agents wanted. Physi 



GAL Culture Chart, with illustrated directions for de- 

 veloping every part of the body healthfully,, 50 cts. Sent for half price to those 

 naming this paper. 



WHITNEY HOME GYMNASIUM CO., Box D., Rochester, N. Y. 



Shoulders and Upper Back, 



