. Electronic apparatus for biological research . Along arc 6Q0O0- plane ^QDOO- 20,000 0 2 10 12 Distance along arc mm Figure Brightness distribution of arc of 250W type ME lamp The luminance varies from point to point on the arc {Figure ). Most of the arc area has a luminance of 20,000 cd/cm^, but there are two small areas, near the electrodes, which reach a luminance of 80,000 cd/cm^ 345

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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity