Stained glass work : a text-book for students and workers in glass (1905)
Whall, Christopher, 1849-1924 · New York : D. Appleton · leaf 47
well as straight. You cannot break these Cutting directly the cut is made, but, holding the (elementary) glass as in fig. 12, and pressing it firmly with the left thumb, jerk the tool up by little, sharp jerks of the fingers only, so … as to tap along the underside of your cut. You will see a little silver line spring along the cut, showing that the glass is dividing ; and when that silver line has sprung from end to end, a gentle pressure will bring the glass apart. 4i
Glass painting and staining
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from St. Nicholas [serial] (1873)](https://img.insideoutlibrary.com/img/200/ia-stnicholasserial412dodg-698-910.webp)
