GB190019331A - Improvements in and connected with Photographic Actinometers - Google Patents

Improvements in and connected with Photographic Actinometers

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Publication number
GB190019331A
GB190019331A GB190019331DA GB190019331A GB 190019331 A GB190019331 A GB 190019331A GB 190019331D A GB190019331D A GB 190019331DA GB 190019331 A GB190019331 A GB 190019331A
Authority
GB
United Kingdom
Prior art keywords
aperture
light
until
brought opposite
photographic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Inventor
Alfred Watkins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of GB190019331A publication Critical patent/GB190019331A/en
Expired legal-status Critical Current

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  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

19,331. Watkins, A. Oct. 29. Exposures, calculating; actinometers.- Relates to an instrument for measuring the chemical intensity of light, combined with a slide-rule apparatus for calculating photographic exposures. The instrument is in the form of a watch. At the back is a disc of photographic printing-paper b, Fig. 2, an unexposed part of which is brought opposite the aperture c, Figs. 1 and 2, and exposed to the light until it just perceptibly darkens, or until it darkens to a standard tint. From the time required for this the actinic strength of the light is determined. By turning the tongue d, the number denoting the sensitiveness of the plate is brought opposite the aperture PLATE, and by turning the tongue e a number denoting the stop is brought opposite the aperture STOP. The watch glass is then turned until the light valve appears at the aperture ACT. The correct exposure is then read off at the aperture EXP. The two discs on which the scales are marked are shown in Figs. 3 and 4.
GB190019331D 1900-10-29 1900-10-29 Improvements in and connected with Photographic Actinometers Expired GB190019331A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB190019331T 1900-10-29

Publications (1)

Publication Number Publication Date
GB190019331A true GB190019331A (en) 1901-09-07

Family

ID=32150035

Family Applications (1)

Application Number Title Priority Date Filing Date
GB190019331D Expired GB190019331A (en) 1900-10-29 1900-10-29 Improvements in and connected with Photographic Actinometers

Country Status (1)

Country Link
GB (1) GB190019331A (en)

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