Materia photographica : a treatise on the manufacture, properties, and uses of the substances employed in photography (1891)
Leaper, Clement J · London : Iliffe · leaf 20
8 MATERIA PHOTOGRAPHICA. … Bunsen'1 s Burner consists of an upright metal tube, through which coal gas passes, whilst at the bottom are openings for the supply of air. It is very useful for heating crucibles, but is apt to localise the heat too much when used with beakers, flasks, etc., for heating which the next burner is…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
