THE WELSBACH SYSTEM OF ILLUMINATION
WELSBACH - ILLUMINATION DATA BOOK. (title page) ENGINEERING DATA OF THE WELSBACH SYSTEM OF ILLUMINATION. Pub. Illuminating Enginering lab. - N.J. Incandescent Gas Lighting Fixtures. 1909. Trade catalog for the manufacturing of gas lighting fixtures for commercial and residential buildings. Photos, lamp models with data for each, interior and exterior models, section on mantles. np. photos, drawings. Brad-bound covers, vg cond.