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IV.—On the Illuminating Power of Groups of Pin-hole Burners

Published online by Cambridge University Press:  15 September 2014

R. G. Harris
R. G. Harris
Affiliation:
Physical Laboratory, Edinburgh University
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Extract

The object of the present series of experiments is to find the variation of the illuminating power of symmetrical groups of pin-hole burners with the distance of adjacent burners.

The burners were fitted so as to slide on a frame composed of two pieces of a metre-rod fastened together to form a cross, as shown in figs. 1 and 2. The stems of the burners were circular in section and cylindrical in bore, the external and internal diameters being 8 mm. and less than 1 mm. respectively. Their bases were bevelled in such a manner that the burners could be fixed so close as to touch each other; thus their centres could be placed at any distance from the centre of the cross from 4 mm. to 10 cm. The standard of illumination with which they were compared was a similar pin-hole burner.

Type
Proceedings
Information
Proceedings of the Royal Society of Edinburgh , Volume 30 , 1910 , pp. 46 - 62
Copyright
Copyright © Royal Society of Edinburgh 1910

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References

page 47 note * In the case of four burners, the frame was of course placed slightly squint, so as to allow 3 and 4 to be visible separately at φ.

page 50 note * Taken during four different days. Pressure was not quite constant, but the observations were reduced to constant pressure by the pressure calibration curve.