Details of the APL (Linotype’s version of the Ludlow) taken from “Linotype Machine Principles” published in 1940.
THE ALL-PURPOSE LINOTYPE (APL) is a complete, self-contained unit for the casting of type in the form of slugs, in faces ranging from 6 point to 144 point; for casting of furniture, rules, borders, decorative and spacing material from 6 to 72 point body, and 42 picas in length.