The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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Calculations and Constants
Thermometers, Weights and Measures, Exposure, Focus and its Bearing on Rapidity, Shutters, and Solubilities, but in this place a few data are given which do not come under these headings, or which may be conveniently tabulated for ready reference: -
Constants to facilitate Rapid Calculation, mostly given as Multipliers.