BSTJ 8: 2. April 1929: Purified Textile Insulation for Telephone Central Office Wiring. (Glenn, H.H.; Wood, E.B.)
A 1929 Bell System Technical Journal article by H.H. Glenn and E.B. Wood, written for telephone engineers, on purifying textile insulation used in central office wiring. Its pictures are laboratory apparatus and a test chart comparing washed and unwashed cotton and silk insulation under humidity, with one clean, technical line-graph a designer could borrow for minimalist data-plot motifs.
