. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 462 KAZUO SHIBATA AND FRANCIS T. HAXO possible to read a high absorhance value accurately because of the absence of interaction (cross talk) between the separate electric channels from the two photo- multipliers. In ordinary recording' spectrophotometers with a single photomulti- plier. the cross talk between alternative sample and reference signals (photo- currents) from the single detector introduces systematic errors to the absorbance reading when the reading is high, b) With the spectrophotometer, absorbance can be read
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 462 KAZUO SHIBATA AND FRANCIS T. HAXO possible to read a high absorhance value accurately because of the absence of interaction (cross talk) between the separate electric channels from the two photo- multipliers. In ordinary recording' spectrophotometers with a single photomulti- plier. the cross talk between alternative sample and reference signals (photo- currents) from the single detector introduces systematic errors to the absorbance reading when the reading is high, b) With the spectrophotometer, absorbance can be read up to 3 by electric amplification, and the use of a light attenuator for the reference beam together with this electric amplification enables us to measure an absorbance value as high as 6. c) The end-on photocathode captures all of the light transmitted through a piece of coral placed close to the photocathode, so that the reading is an absolute value of semi-integral attenuance (Shibata, 1958 and Shibata, 1959) necessary to calculate the transmittance through such translucent samples (Shibata, Benson and Calvin, 1954). This contrasts with the measure- ments with the side-on type of photomultipliers commonly used. The small photo- cathode inside the tube of the side-on type captures only a small fraction of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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