28S 



BELL SYSTEM TECHNICAL JOURNAL 



test points along the cable at intervals of about 2300 feet, as employed in 

 the observations, it should thus be possible to secure substantial indications 

 at a number of points along the test section, although closer spacings would 

 of course be desirable. 



INSTRUMENT 



I 1 



i I I 



PLAN 



MARKER POST 



ELECTROLYSIS// 



WIRES 



GUARD POST 



o 



SURGE 

 VOLTMETER- 

 BOX 



ELEVATION 



SURGE 

 INTEGRATOR 



■'mmmmm//mmmm^m//^m''4 



TT 



recorders: 

 — crest-current 



-f-vJ SURGE -FRONT 



•E^^^^^g- 



j:.. 



il i 



v^/m// 



^^JsL 



Fig, 7 — Typical instrument arrangement at splice points about 2300 feet apart. 



In Fig. 6 is shown the 21.5-mile test section and in Fig. 7 a typical installa- 

 tion at every second splice in the cable. At these points the lead sheath is 

 accessible through a lead gas-pressure pipe extending to a marker post,^ 

 an arrangement which was utilized in making measurements of voltage 

 between the sheath and the outside copper shield. At the same points an 



