a chamber into which said contacting pieces project, and a water-lens carried by said chamber, all substantially as described.
10. In apparatus for receiving light-waves, contacting pieces of sensitive substance which will give a characteristic curve (giving the relation between an increasing impressed electromotive force and the resultant current passing through the sensitive substance) which is not straight, but either convex or concave to the axis of electromotive force and in which the return curve with a decreasing electromotive force, when taken slowly, approximately coincides with the former curve, said contacting pieces being in combination with conducting-arms carrying the same, said arms being pivoted together, a spring tending to hold said contacting pieces together, a micrometer-screw adapted to adjust the force of said spring and therefore the force of contact of said contactmg pieces, an insulating-tube in which said arms and spring are fitted, means for insulating said arms from each other except at the point of contact of said contacting pieces, a metallic part such as 12 having an extension such as 11, a casing or chamber such as 12a 12b, and a lens fitted in said chamber, all substantially as and for the purpose described.
In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.
JAGADIS CHUNDER BOSE.
Witnesses:
- Reginald Eaton Ellis,
- Thomas Lany Whitehead.
