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Abstract
An objective method of measuring the amount of red color in the skin of apples is an advantage over the subjective methods (1). Tristimulus colorimetry is well established as an objective method of measuring color in agricultural products (2,3,4). Attachments used with the Hunter Color and Color Difference Meters in the past for apple skin color measurements were those in which the apples turned at approximately 200 rpm in a stationarv position over the Hunter Meter (1). The meter is adjusted to the rotating apple by moving the Hunter Meter up and down. In Figure I is a device in which the rotating apple is moved up and down for the adjustment instead of the Gardner Color Difference Meter. The attachment consists of two shafts to rotate an apple over the exposure head of the measuring instrument. The right hand shaft operates against a thrust bearing and can be moved to the light to allow the apple to be placed between two rubber suction cups. A pin, through the shaft, holding a spring against the thrust bearing, can be positioned to van7 the pressure which keeps the apple in place. A Sunbeam Master Mixer switch can be adjusted so that the apple turns at approximately 200 rpm. The master mixer and its attachments are moved up and down on a shaft. This shaft is attached to a stand which is separate from the meter stand. The spinning device stand consists of a base plate and veitical pipe. The vertical pipe is so constructed that it can be adjusted for height. Since the distance between the rotating apple and the exposure head is critical, one must be able to adjust the apple so that it just clears the exposure.