﻿564 



Mr. Carl Bar us on Telephonic 



Table {continued). 



Signal. 



i\ 



di\ 

 Ai'. 



di'/Ai', 



E. 

 e/E. 



K. 



r. 



Remarks. 



Noise. 



? 



Noise. 



-1-3 

 -11 

 +1-1 



+ 1-3 



•2 

 2-2 

 9 



2 

 •500 

 20050 

 20000 



Double telephone*. 



Noise. 



? 



? 

 Noise. 



Noise. 



? 



? 

 Noise. 



- -9 



- -6 

 + -6 

 + '9 



•2 



1-2 

 5 



2 

 •500 

 20050 

 20000 



Do* 



Coils nearer 



diaphragm. 



-•43 

 -•31 

 + •31 

 +•43 



•12 

 •62 

 5-2 



2 

 •501 

 19970 

 20000 



Do* 

 New coarse- 

 toothed key. 



Noise. 



? 



? 

 Noise. 



- -9 



- -6 

 + '6 

 + -9 



•2 



1-2 

 5 



2 

 •500 

 20050 

 20000 



Do.* 

 Coils in parallel. 



Noise. 



? 



? 

 Noise. 



-4-4 

 -40 

 +3-7 

 +4-2 



•5 



7-7 

 16 



2 



•486 

 21300 

 20000 



Bell telephone, 

 low resistance, 

 plate '02 centim. 

 thick. 



Noise. 



? 



? 

 Noise. 



-42 

 -37 

 +35 

 +4-0 



•5 

 72 

 15 



2 



•489 

 21000 

 20000 



Bell telephonet, 

 high resistance, 

 plate "02 centim. 



Noise. 



? 



? 

 Noise. 



-20 

 -15 

 +1-4 

 +19 



•5 

 2-9 

 6 



2 

 •494 

 20500 

 20000 



Same with tin 

 plate '016 centim. 



Noise. 



V 



? 



Noise. 



-31 

 -2-6 

 +2-5 

 +3-0 



•5 

 51 

 11 



2 

 •496 



20000 



Same with plate 

 reversed. 



Noise. 



? 



? 

 Noise. 



-21 

 -1-6 

 +16 

 +20 



•5 

 32 



7 



2 

 20350 



20000 



Same with iron 

 plate "018 centim. 



Noise. 



? 



? 

 Noise. 



-10 



- -8 

 + '7 

 +1-0 



■2 

 1-5 

 6 



2 

 •501 

 20000 

 20000 



Same with tin plate 

 •030 centim., and 

 tin plate - 016 

 centim. 



* Coils with 3000 and 3600 turns respectively, 1*25 centim. long, -8 centim. 

 internal diameter, 2*5 centim. (about) external diameter. 



t Coil with 2400 turns, 1-25 centim. long, *8 centim. internal diameter, 

 2 centim. external diameter. 



