SOURCE: Encyclopedie methodique. Arts et metiers mecaniques (Paris 1784), planches vol. III, pl. 1 (detail) of section 'Instruments de mathematiques, fabrications'
SOURCE: Builder, vol. 22, 1864 Dec. 10, p. 901 NOTES: Heaton Butler and Bayne were one of the leading Gothic Revival stained glass manufacturers with their studio and workshop in Covent Garden.
SOURCE: Londina illustrata (London, 1819), part 1, pl. 73