actinograph

[ ak-tin-uh-graf, -grahf ]

noun

1. a recording actinometer.

Other Words From

• ac·tin·o·graph·ic [ak-tin-, uh, -, graf, -ik, ak-t, uh, -noh-], adjective
• ac·ti·nog·ra·phy [ak-t, uh, -, nog, -r, uh, -fee], noun

Word History and Origins

Origin of actinograph¹

First recorded in 1830–40; actino- + -graph

Example Sentences

The "Actinograph" number or speed number of a plate in the H. & D. system is found by dividing 34 by a number known as the Inertia, the Inertia, which is a measure of the insensitiveness of the plate, being determined according to the directions laid down by Hurter & Driffield—that is, by using pyro-soda developer and the straight portion only of the density curve.

From Project Gutenberg