CONQUEST OF DISTANCE BY WIRE TELEPHONY 413 



3. Work and tests connected with the development of the Bleakeney- 

 Chetwood balance for use on telegraph lines subjected to heavy al- 

 ternating current induction. 



4. Tests of Mr. Athearn's circuit for use on lines subjected to alter- 

 nating current railway induction. 



Transpositions. 



■ 1. The development of a transposition system for short spur and loop 

 lines. 



2. The development of a transposition system for short toll lines. 



3. The development of a phantom system of transpositions for the aerial 

 line between Philadelphia and Atlantic City. 



4. The preparation of a complete set of phantom transposition drawings 

 and the preparation of a circular letter on phantom transpositions. 



Transmission. 



*1. Transmission study of the Boston and Maine circuits. 



2. A study of the bridging effects of various types of ringers. 



3. Transmission tests on the Boston and Wellesley loaded cable. 



4. Transmission tests on the Boston-Hingham loaded cable. 



5. Transmission investigation of the Boston-Chicago repeater circuits. 



6. Transmission tests on the Grant-Brushton loaded cable. 



7. A transmission investigation of the 48-volt exchange at Bryn Maw^r, 

 Pennsylvania. 



8. A study of the conditions affecting long distance service from 

 Buffalo, Rochester and Louisville. 



9. A study of the conditions affecting long distance service between 

 the Union Pacific Railroad Company's private branch exchange in 

 New York and the Illinois Trust and Savings Bank's private branch 

 exchange in Chicago. 



*10. The commencement of a general study of the conditions affecting 

 long distance transmission. 



11. The determination of the transmission losses in various types of 

 cord circuits. 



12. The determination of the transmission losses in various types of 

 outside distributing wire and switchboard cable. 



Miscellaneous. 



1. A study of the effect of multipling call wires and terminal offices. 

 *2. A study of multiplex telephone (Weintraub system). 

 3. A study of the Cooper-Hew'itt rectifier for use in charging storage 

 batteries. 



