Page:US Patent 755840 (Bose's Microwave Apparatus).djvu/5

4, or other radiations, galena as a sensitive substance.

3. A coherer or detector of electrical disturbances, Hertzian waves, light-waves or other radiations, comprising contacting pieces of sensitive substance having 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 is 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, in combination with means for adjusting the force of contact between said contacting pieces.

4. A coherer or detector of electrical disturbances, Hertzian waves, light-waves, or other radiations, comprising contacting pieces of sensitive substance having 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 is 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, pivoted conducting-arms carrying said contacting pieces, a spring tending to hold said contacts together, and a micrometer-screw for adjusting the force of contact of said contacting pieces, substantially as described.

5. A coherer or detector of electrical disturbances, Hertzian waves, light-waves, or other radiations, comprising a pair of contacts of sensitive substance having 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 is either convex or concave to the axis of electromotive force and in which the return curve with decreasing electromotive force when taken slowly, approximately coincides with the former curve, pivoted conducting-arms carrying said contacts and insulated from each other except at the contacting point of said contacts, a spring tending to hold said contacts together, a micrometer-screw for adjusting the force of contact of said contacts, and means for insulating said arms from each other except at the point of contact of said contacting pieces and from external objects, substantially as described.

6. A coherer or detector of electrical disturbances, Hertzian waves, light-waves, or other radiations, comprising a pair of galena contacts, pivoted conducting-arms carrying said contacts and insulated from each other except at the contacting point of said contacts, a spring tending to hold said contacts together, a micrometer-screw for adjusting the force of contact of said contacts, and means for insulating said arms from each other except at the point of contact of said contacting pieces and from external objects, substantially as described.

7. 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 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, in combination with a chamber inclosing said contacting pieces, and a lens disposed to direct light-rays onto said contacting pieces, substantially as described.

8. 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, means for adjusting the force of said spring and therefore the force of contact of said contacting pieces, means for insulating said arms from each other except at the contacting point of said contacting pieces, and from external objects, a chamber into which said contacting pieces project, and a lens carried by said chamber, all substantially as described.

9. 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 same, said arms being pivoted together, a spring tending to hold said contacting pieces together, means for adjusting the force of said spring and therefore the force of contact of said contacting pieces, means for insulating said arms from each other except at the contacting point of said contacting pieces, and from external objects,