CHAPTER IV.

41. Discharge Tube in Primary Current. GASSIOT Striæ. Least E. M. F. Required.

42. Current Interrupted Inside of Discharge POGGENDORFF Tube instead of Outside.

43. Source of Striæ at the Anode. Color DE LA RUE and Changed by Change of Current. MÜLLER

44. Dark Bands by Small Discharges SOLOMONS Disappear on Increase of Current, and Appear Again by Further Increase.

45. Motion of Striæ. Method of Obtaining SPOTTISWOODE Motion when Desired and of Stopping the Same.

46. Motion of Striæ Checked at the Cathode. THOMSON, J. J. Tube, 50 ft. Long. The Anode the Starting-point.

47. Electrolysis in Discharge Tube. THOMSON, J. J.

48. Heat Striæ without Luminous Striæ. DE LA RUE and MÜLLER

49. Sensitive State. Method of Obtaining. SPOTTISWOODE Telephone Used to Prove and MOULTON Intermissions.

49_a_. Cause of Sensitive State Detected by SPOTTISWOODE Telephone. and MOULTON

50. Sensitive State Illustrated by a REITLINGER and Flexible Conductor within the URBANITZKY Discharge Tube.

51. System of Operating Discharge Tubes. TESLA Excessively High Potential and Enormous Frequency.

52. Discharge-tube Phenomena by MOORE Self-induced Currents.