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

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 53a. Form of selenium cell used by Bell and Tainter 110 54. Diagram showing construction of modern cell 111 55. Resistance curve of selenium cell 111 55a. Actual curve of selenium cell 112 56. Diagram of Professor Korn's method for counteracting inertia 113 57. Arrangement of plate sheath and line screen 117 58. Details of clips to hold line screen 118 59. Arrangement of apparatus for copying 119 60. Drawing showing method of arranging camera and copying stand for adjustment 119

61. Photograph of line screen and metal print
62. Photograph of sketch drawn upon metal foil

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