Yields information about the stringing of the overhead for various temperatures and span - would have been used in the field.
Physical description
Duplicate copy - Memo from Electrical Engineer to General Superintendent, dated 26/3/1939, giving "Electric Railway" stringing tables for 3/0 grooved wire on 40 and 80 for spans, against given temperatures. Has initials ET/MB/LH in bottom left hand corner. Copy to Electrical Superintendent.
