SCIENCE. 



[Vol. XXII. No. 569 



Probably you take 



THE 



Electrical Engineer. 



Most people interested in Electricity 



do. 

 If yon do not, now is a good time to 



begin. 



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Address: 



•The Electrical Engineer, 

 203 Broadway, - - - New York, N. Y 



THE 



Bdl Te 



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 oi 

 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 wiih a coil upon the end or endf- 

 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 permaneni 

 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 ol 

 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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