Windows : a book about stained & painted glass (1909)
Day, Lewis F. (Lewis Foreman), 1845-1910 · London : B. T. Batsford · leaf 40
is central rosettes to the aid of paint. It will be observed that in the marginal lines which frame this window, and again in the white bands in two out of the three patterns from Salisbury (17, 18), leads are introduced which have only a constructional use, and rather confuse the design. That… … art of the designer consists in so 14. Chalons.
Glass painting and staining · Windows
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.