polarisation receiver 53

29. Arrangement of kathode-ray receiver 54

30. Connections of electrolytic receiver 56

31. Drawing of improved stylus for receiving 58

32. Drawing of Hughes telegraph governor 66

33. Arrangement of simple speed regulator 68

34. Diagram of connections of simple speed regulator 68

35. Author's arrangement for complete radio-photographic station 77

36. Drawing of transmitting machine and circuit breaker 78

37. Drawing of special transmitting stylus showing adjusting
arrangements 79

37a. End view of transmitting stylus 79

38. Connections of new type of relay designed by the Author 80

39. Arrangement of mercury containers and dipping rods for relay 82

40. Drawing of Author's receiver 84

41. Enlarged drawing of diaphragm and steel point 84

41a. Drawing showing arrangement of bush and counter-weight 84

42. Optical arrangements of receiver 85

43. Optical arrangements of receiver 86

44. Drawing of circuit breaker 88

45. Drawing of friction brake 89

46. Sectional drawing of magnetic clutch 90

47. Plan of magnetic clutch 90

48. Details of Isochroniser 92

49. Connections of Isochroniser 94

50. Dial of Isochroniser 94

51. Diagram of driving mechanism 96

{xv}
52. Diagram showing starting positions of machines 97

52a. Arrangement of small type Nernst lamp 99

52b. Ballasting resistances for Nernst lamps 100

52c. Arrangement of large type Nernst lamp 101

53. Connections of selenium cell elements 110