intelligible -- but the tones of the voice were audible all over the Telegraph office. 
I was able to understand the articulation -- at a distance of six feet from the instrument by placing my ear against the table upon which the telephone stood. The power we obtain from these instruments is marvellous beyond belief. -- We were able to hold conversation this morning between Boston and Salem with oils of only four ohms resistance! The resistance of the line and relays upon it must have been not less that 500 or 600 ohms. 

In spite of there being no battery we were annoyed by sounds of operating and made experiments to determine the cause of such sounds. 

Fearing that some current from another line was leaking on to ours by the earth connections -- we made a metallic circuit to Salem without any ground wires -- by using two lines as shown in the diagram -- and still we heard the sounds of operating upon other lines. The cause is therefore evident. The other wires were carried on the same poles with ours and parallel to them -- so that an inductive action was exerted by one wire upon the other. 

I was glad to notice that as we increased the resistance of our Telephone-coils -- the vocal sounds became louder and the sound of operating feebler. I believe we can make the 
