Bromide paper : instructions for contact printing and enlarging (1896)
Just, E. A · Bradford : P. Lund, Humphries · leaf 33
ften as possible, as the flames of large lamps (especially when enclosed in the tin box) will begin to smoke when the lamp is kept burning for some time, in consequence of the heating of the burner. Escape of the Heat. — The oftener the air in the box is changed and the cooler the lamp will keep.… … Fig. C. Gas Illumination. — The comfort, convenience and cleanli- ness of gas are well known. It will be interesting to learn a few data regarding different kinds of gas burners, as they show the intensity of the light and the amount of gas consumed per hour by each flame when burning London gas.…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
