actinograph

American

[ak-tin-uh-graf, -grahf] / ækˈtɪn əˌgræf, -ˌgrɑf /

noun

a recording actinometer.

Other Word Forms

actinographic adjective
actinography noun

Etymology

Origin of actinograph

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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023