42. Explain the manufacture of jam-tin bomb? 43. Explain the manufacture of the powder-puff. 44. Explain the manufacture of the hair-brush bomb? 45. What explosive is used in the hair-brush bomb? 46. Describe the impact or percussion type of grenade? 47. How is the dummy type made which represents the impact and percussion type? 48. Up to what weight may dummies be made? 49. How far may a 2-pound bomb be thrown? 50. How far may a 1-pound bomb be thrown? 51. Explain the correct throwing position for trench work? 52. When may a man be said to be trained in throwing from a trench? 53. What are the defensive uses of bombs and grenades? 54. What are the offensive uses of bombs and grenades? Lecture IV. 55. What is a saphead? 56. Explain some of the different types of sapheads used. 57. What advantage has it over a “T” shaped saphead? 58. What is meant by an island saphead? 59. Name the digging and cutting tools? 60. What materials are used in trench warfare? 61. How are sandbags filled? Tied? Passed? Built? 62. What are the uses made of sandbags? 63. What is meant by “bond” in use in sandbags? 64. To what uses are the following materials put in trench warfare: Earth? Sods? Timber? Brush? Barb Wire? Bale Wire? 65. How are sods built to obtain the best results? 66. What is a revetment? Traverse? Bay? Parapet? Parados? Obstacle? 67. What are obstacles used for? 68. How many men usually constitute a sentry and relief per bay in a trench? 69. What arrangements are made for sleep and rest of reliefs? 70. Why are relief pits put in rear of trench? 71. Why are they made shallow? 72. What style of a trench is best suited to bomb warfare? 73. What precautions may be taken to prevent enemy’s bombs getting into our trench? 74. What are the disadvantages of having relief pit under the parapet? 75. What are the disadvantages of having a deep trench? 76. What provisions should be made so that our men could advance from the trench at the same instant? 77. What is a “dead man”? “Funk Hole”? Lecture V. 78. Who are usually the first men of the Infantry to advance in a frontal attack? 79. How are they armed? What tools do they carry? What are their duties? 80. When the first line advances what do the wire cutters do? 81. What part do the bombers take on a frontal attack? 82. Who is responsible that there is a supply of bombs in the trench? 83. How are bombs stored in the trenches? 84. Where is the reserve supply of bombs stored? 85. What general arrangements are made preparatory to frontal attack? 86. What arms of the service may take part in a frontal attack? 87. What extent of frontage is usually planned to be occupied in a frontal attack? Ans. Only the extent of frontage that is absolutely necessary.