摘要:

When an illuminated wall of a room is observed by the two eyes, before one of which a tube with opaque sides is held, the patch of the wall seen through the tube appears brighter and nearer to the eye than the rest of the surface appears to the other eye. This may be termed the photoscopic effect.If the side of the tube is translucent and brightly illuminated, the patch of the wall will appear darker than the remainder of the surface. When a sectored disc is rotated at a certain critical speed in front of the tube, the patch of the wall seen through it appears intensely black. This appearance of blackness is called the scotoscopic effect.The critical speed of rotation of the disc at which the scotoscopic effect appears, differs for the fovea, macula and periphery of the retina. The respective areas of those regions are quite sharply distinguished from one another.

ISSN:1923-4287    

DOI:10.1139/cjr36a-009

出版商:NRC Research Press    

年代:1936

数据来源: NRC

摘要:

The values for the natural wave-length of an antenna obtained by direct measurement and by the "intercept method" were found to disagree. In the investigation of the cause of this disagreement, a reactance method was developed for measuring the natural wave-length of an antenna. The data obtained in this method can be used to obtain points on the intercept method graph for relatively small values of inserted inductance. These points do not fall on a straight line, probably owing to variations occurring in the antenna input inductance and capacity near the natural wave-length.

ISSN:1923-4287    

DOI:10.1139/cjr36a-010

出版商:NRC Research Press    

年代:1936

数据来源: NRC