412 BELL SYSTEM TECHNICAL JOURNAL 



11. A study for the loading of open wire circuits for the New England 

 Telephone and Telegraph Company. 



12. A study for the loading of open wire circuits for the Southern Bell 

 Telephone Company. 



Measuring Apparatus. 



1. The design of a new artificial cable using Ward Leonard enamel re- 

 resistances. 



2. The development of a method for determining transmission equiva- 

 lents by means of an alternating current dynamometer measurement. 



3. The development of a design of a universal receiver shunt for use in 

 determining line equivalents. 



4. The design and construction of a capacity unbalance testing set 

 for the Central District and Printing Telegraph Company. 



5. The development and construction of a testing set for use in transmis- 

 sion investigations. 



Protection. 



1. The completion of a design on the experimental system of high po- 

 tential protection for substations and the preparation of a circular 

 letter on the same. 



2. The development and construction of a high potential protected 

 cable terminal. 



3. An investigation of the Birsfield central ofhce protector. 



Repeaters. 



1. A study of the distortion introduced by the presence of telephone 

 repeaters in an open wire circuit. 



2. A study of the efficiency of telephone repeaters when used in tandem 

 on long haul circuits. 



3. The design of an induction telephone repeater. 



Switchboards. 



*1. A study looking to the development of fire-proof switchboard re- 

 sistances. 



*2. A study for the development of an eflicient type of Private Branch 

 Exchange circuit. 



Telegraph. 



1. A study of phantoplex interference and a development of remedies 

 for the same. 



2. An investigation of the Field quadruplex telegraph. 



