This section is from the book "Spons' Mechanics' Own Book: A Manual For Handicraftsmen And Amateurs", by Edward Spon. Also available from Amazon: Spons' Mechanics' Own Book.
The tools employed by glaziers comprise a rule, for measuring the glass; putty knives of the form shown in Fig. 1361 which needs no pressure but that of the hands, and of the form in Fig. 1362 which requires the assistance of a hammer for removing old hard putty; and a diamond or other contrivance for cutting glass. The diamond is unquestionably the most perfect tool for cutting glass, but it is often replaced by the American substitute illustrated in Fig. 1363, which consists of a stout blade carrying a small hard steel wheel at the tip, with notches in the blade for breaking off projecting edges that have not parted cleanly. Non-professional glaziers would do well to purchase their glass ready cut to accurate dimensions.