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Retinal sensibility to saturation differences
NOTES
FROM THE RESEARCH LABORATORY, EASTMAN KODAK COMPANY.*
RETINAL SENSIBILITY TO SATURATION DIFFERENCES. 1 By L. A. Jones and E. M. Lowry.
OF THE three attributes of color, brilliance, hue, and saturation, the latter has probably been accorded the least attention. The present work was undertaken for the purpose of obtaining specific data on this subject. Using a modified Nutting colorimeter the sensibility of the eye to saturation differences was determined for the following colors: Blue, blue-green, green, yellow, orange, and red. The number of equal sensation steps was found to vary for different colors. Saturation scales were constructed by integrating ,the sensibility curves. Illustrative data will be presented and discussed. The L a w of the Resistance Met by Spheres Moving Rapidly in Water. W. BAUER. (Ann. der Phys., No. i i , 1926.)--From a horizontal gun barrel bullets were shot through a vessel containing water and the loss of velocity thereby caused was measured by electrical means. The sides of the water vessel were made of paper and offered little resistance to the projectile. Their distance apart could be changed so as to vary the length of the path in water. Deformation of the projectile was avoided by using a smooth and not a rifled bore, and by employing steel spheres. Their diameter was I I mm. A new ball was used for every shot because the stopping arrangement scarred, the ball. By graduating the quantity of powder used, the speed was controlled. Its maximum value was 65o m. per sec. and the minimum 15o m. per sec. After leaving the muzzle of the gun the ball traverses openings in two screens that serve to keep the explosion gases from the rest of the apparatus. It then passes between the parallel sides of a hairpin made of glass-hard steel wire. This breaks, and by so doing starts the discharge of a condenser, the electrical charge of which is known, through a coil. Next the ball meets and breaks a second hairpin by which the discharge of the condenser is stopped. From the distance apart of the two hairpins and the quantity of electricity discharged while the ball is going from the first to the second the speed of the ball can be calculated. The ball then goes through the vessel of * Communicated by the Director. 1Communication No. 254 from the Research Laboratories of the Eastman Kodak Company and published in J. Opt. Soc. Amer.. x3:25, 1926. 381
FROM THE RESEARCH LABORATORY, EASTMAN KODAK COMPANY.*
RETINAL SENSIBILITY TO SATURATION DIFFERENCES. 1 By L. A. Jones and E. M. Lowry.
OF THE three attributes of color, brilliance, hue, and saturation, the latter has probably been accorded the least attention. The present work was undertaken for the purpose of obtaining specific data on this subject. Using a modified Nutting colorimeter the sensibility of the eye to saturation differences was determined for the following colors: Blue, blue-green, green, yellow, orange, and red. The number of equal sensation steps was found to vary for different colors. Saturation scales were constructed by integrating ,the sensibility curves. Illustrative data will be presented and discussed. The L a w of the Resistance Met by Spheres Moving Rapidly in Water. W. BAUER. (Ann. der Phys., No. i i , 1926.)--From a horizontal gun barrel bullets were shot through a vessel containing water and the loss of velocity thereby caused was measured by electrical means. The sides of the water vessel were made of paper and offered little resistance to the projectile. Their distance apart could be changed so as to vary the length of the path in water. Deformation of the projectile was avoided by using a smooth and not a rifled bore, and by employing steel spheres. Their diameter was I I mm. A new ball was used for every shot because the stopping arrangement scarred, the ball. By graduating the quantity of powder used, the speed was controlled. Its maximum value was 65o m. per sec. and the minimum 15o m. per sec. After leaving the muzzle of the gun the ball traverses openings in two screens that serve to keep the explosion gases from the rest of the apparatus. It then passes between the parallel sides of a hairpin made of glass-hard steel wire. This breaks, and by so doing starts the discharge of a condenser, the electrical charge of which is known, through a coil. Next the ball meets and breaks a second hairpin by which the discharge of the condenser is stopped. From the distance apart of the two hairpins and the quantity of electricity discharged while the ball is going from the first to the second the speed of the ball can be calculated. The ball then goes through the vessel of * Communicated by the Director. 1Communication No. 254 from the Research Laboratories of the Eastman Kodak Company and published in J. Opt. Soc. Amer.. x3:25, 1926. 381