Tape - Scotch 3", 600 Feet.
These were the tapes I liked to use before I had a 5" battery tape recorder. Triple play gave half an hour per side at a tape speed of 3.75" per second, plus the Scotch brand was excellent quality. The big problem came later if they were played back on the Ferrograph Series 4. To get 600 feet on a 3" spool demanded a very thin tape, the Ferrograph's rewind is so fast that when you stopped it the tape would break; the lesson was soon learned!!!
