336 



SCIENCE. 



[Vol. XXI. No. 541 



THE 



Atricaii Bell Telepliie 



COMPANY. 



125 MILK ST., BOSTON, 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 capable 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. 



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LIGHTNING DESTROYS! 



Shall it be your house or a 

 pound of copper ? 



Entirely new departure in pro- 

 tecting buildings from lightning. 

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Correspondence solicited. Agents wanted. 



AMERICAN LIGHTNING PROTECTION CO., 



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Fact and Theory Papers 



I. THE SUPPRESSION OF CON- 

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

 12°. 40c. 



II. THE SOCIETY AND THE " FAD." 



By Appleton Mokgan, Ksq. 12°. 20 cents. 



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VII. HOUSEHOLD HYGIENE. By 

 Mart 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 

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 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, if 

 sponse to date. 



11. No re- 



N. D. C. HODGES, 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. 



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