… handling e.g., paints containing an active anti‑rust pigment for example, red lead, zinc powder, zinc oxide, zinc … iron oxide (iron minium, jewellers’ rouge), and non‑pigmented coatings with a basis of oil, grease, wax, …
… an aperture (e.g., gate, disc, ball, plug, needle or diaphragm). They may be operated by hand (by means of a key, … stopper which is generally controlled by a pressure device (diaphragm, bellows, capsule, etc.) damped by an adjustable …
… essentially of a light‑tight chamber, a lens, a shutter, a diaphragm, a holder for a photographic plate or film, and a … bellows; ball and socket mounting heads; shutters and diaphragms; shutter (including delayed action) releases; …
