Page:On the Influence of the Thickness of Air-space on Total Reflection of Electric Radiation.djvu/9

When radiation is absorbed by the receiver the resistance is decreased and this diminution of the resistance is found from the new balancing resistance.

Fig. 3.—G, the differential galvanometer; R, the receiver; r, the resistance box.

All observations agreed in showing that as the thickness of air-space was gradually decreased, the transmitted component was increased, with a corresponding decrease of the reflected portion. I give below two sets of observations, in which the receiver acted better than usual. The results are to be taken more as qualitative, as no reliance can be placed on the sensibility of the receiver being absolutely uniform.

Radiator R₂; distance between the sparking surfaces = 10·1 mm.

	Thickness of air-space in terms of number of cards.		Thickness in mm.		Galvanometer deflection due to the reflected portion.		Galvanometer deflection due to the transmitted portion.
	1		0·45		0 or very slight.		Against the stop.
	2		0·90		Slight.		⁠,,⁠,,
	4		1·8		80		160
	8		3·6		145		150
	10		4·5		150		120
	12		5·4		160		100
	16		7·2		Against the stop		30
	18		8·1		⁠,,⁠,,		0