Materia photographica : a treatise on the manufacture, properties, and uses of the substances employed in photography (1891)
Leaper, Clement J · London : Iliffe · leaf 232
o the mark with water. Graduated Flasks. These are sufficiently described by their name, the graduation being effected by a ring etched round the neck of the flask. Flasks of 1,000, 500, and 250 cc. capacity will be required. Specific Gravity Flasks. These are small bottles, containing when filled… … containing 10 grams water and provided with a thermometer stopper, and another of the Regnault pattern containing 50 grams water. Each of these should be weighed once for all, and the weight noted. Of course, care must be taken that when weighing it the flask is perfectly dry and clean4
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
