. Journal of radiology . Time Gauge for Photographic Developing time starting at three minutes and twentyseconds for the uppermost graduationwhich represents a temperature of 70°and extending downwardly therefromto the lowermost graduation represent-ing six minutes and forty seconds. Theminutes represented by the graduations(6) are, preferably, marked upon thebase of the gauge at said graduations atone side of the tube (2), and the sec-onds indicated by the graduation are. preferably, marked upon the base of y the gauge at the opposite side of thetube (2). Above the numerals representing themi
. Journal of radiology . Time Gauge for Photographic Developing time starting at three minutes and twentyseconds for the uppermost graduationwhich represents a temperature of 70°and extending downwardly therefromto the lowermost graduation represent-ing six minutes and forty seconds. Theminutes represented by the graduations(6) are, preferably, marked upon thebase of the gauge at said graduations atone side of the tube (2), and the sec-onds indicated by the graduation are. preferably, marked upon the base of y the gauge at the opposite side of thetube (2). Above the numerals representing theminute graduations the word Min-utes or an abbreviation thereof is,preferably, marked upon the base ofthe gauge as shown (7), and similarly /the word Seconds or an abbrevia-^*tion thereof is marked upon the base ofthe gauge as shown (8) above thenumerals representing the second grad-uations. The middle graduation of theseries indicating a temperature of 65F. and marked to indicate five minutesis, preferably, also marked w
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Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1922
