LIST OF PARTS.
1. Butt plate. 2. Butt plate screws (2). 3. Buttstock. 4. Butt tang screw. 5. Butt tang. 7. Butt latch. 8. Back sight bed spring. 9. Back sight bed spring screw. 10. Butt latch spring. 11. Back sight bed. 13. Feed cover. 14. Back sight leaf. 20. Back sight slide. 21. Ejector. 22. Guard side pieces (2). 23. Back sight axis pin washer. 24. Back sight axis pin. 26. Receiver. 27. Magazine pawls spring. 28. Stop pawl. 29. Rebound pawl. 30. Trigger. 31. Feed operating stud. 32. Safety (right and left). 33. Trigger pin. 34. Feed operating arm. 35. Feed pawl. 36. Feed pawl spring. 37. Bolt. 38. Charging handle. 39. Guard. 40. Cartridge guide spring. 41. Sear spring. 42. Sear spring box. 43. Magazine pan. 44. Ejector cover. 45. Extractors (2). 46. Gear stop. 47. Striker fixing pin. 48. Gear stop pin. 49. Gear stop spring. 50. Striker. 51. Cartridge spacer ring. 52. Gear. 53. Mainspring casing. 54. Magazine top plate rivets (6). 55. Mainspring. 56. Collet pin. 57. Mainspring collet. 58. Magazine centre. 59. Mainspring rivets (2). 60. Magazine latch spring. 61. Gear casing. 62. Magazine latch. 63. Centre key. 65. Gear case hinge pin. 66. Feed operating arm latch. 67. Magazine top plate. 68. Receiver lock pin. 69. Spacer ring rivets (5). 70. Interior separators (25). 71. Radiator casing rear, locking piece. 72. Rack. 74. Radiator casing rear. 75. Piston connecting pin. 76. Barrel. 77. Gas cylinder. 78. Radiator. 79. Piston. 80. Regulator key stud. 81. Gas regulator key. 82. Gas chamber. 83. Gas chamber band. 84. Gas regulator cup. 85. Clamp ring. 86. Front sight. 87. Clamp ring positioning screw. 88. Clamp ring screw. 89. Barrel mouthpiece. 90. Radiator casing front. 91. Sear (rear). 92. Hand grip. 93. Oil well. 94. Oil well cap. 95. Oil brush. 96. Spade grip butt tang. 97. Deflector. 98. Deflector arm. 99. Deflector arm joint pin. 100. Deflector clip. 101. Deflector clip joint pin. 102. Deflector bracket. 103. Deflector clamp screw. 104. Deflector latch. 105. Deflector latch screw. 106. Deflector clamp screw washer. 107. Deflector clamp screw stop nut. 108. Shell catcher bag. 109. Mounting yoke. 110. Mounting yoke clamp. 111. Mounting yoke bronze pillar. 112. Mounting yoke pillar screw. 113. Mounting yoke clamp hinge pin. 114. Mounting yoke clamp pin. 115. Mounting yoke clamp key. 116. Back sight elevating screw. 117. Back sight elevating screw head. 118. Back sight elevating screw head pin. 119. Back sight elevating screw head spring. 120. Sear pin. 121. Butt latch pin. 122. Mounting yoke pillar hinge pin. 123. Mounting yoke chain. 124. Mounting standard. 125. Light field mount bottom cross brace. 126. Light field mount centre post. 127. Light field mount feet (2). 128. Light field mount front legs (2). 129. Light field mount front yoke. 130. Light field mount knuckle joint. 131. Light field mount knuckle joint pin. 132. Light field mount rear brace. 133. Light field mount T joint, centre. 134. Light field mount T joint, side (2). 135. Light field mount top lug. 136. Barrel mouthpiece spanner. 137. Magazine filling handle.
Plate VI.
LEWIS AUTOMATIC MACHINE GUN.
Description.
The gun complete weighs 25¼ lbs. and can be withdrawn from its leather case and put into action immediately.
There are only 62 parts in the gun proper—these cannot be wrongly assembled, and require no adjustment.
No water is used for cooling purposes, the steel barrel being closely fitted with a jacket of aluminium having deeply-cut grooves throughout its length. Over this is a thin tubular steel casing, the muzzle end of which extends (in reduced diameter) beyond the end of barrel, the special shaped mouthpiece screwed to the end of barrel serving the double purpose of firmly securing the radiator in place and of directing the powder blast of each discharge as to greatly increase the “ejector action” of this blast in sucking cool air through the grooves of the radiator. The system is so effective that the gun is found to give a slightly greater velocity to the bullet than can be obtained from the same length of barrel in a shoulder arm firing the same ammunition. There is no excessive recoil and the gun can be used with or without mount.
The gun is fed from a rotating drum magazine, which is controlled by the reciprocating breech mechanism.