=5. Instruction on Miniature Ranges.=--Directions for night firing on miniature ranges are contained in Sec. 74, para. 7. Section =68=.--Hand Grenade (Mark I). =1. General Description= (see Fig. 52).--The grenade consists of the following principal parts: Cap A, body B, detonator C, cane handle D, wood block E, tail F, charge G, and cast-iron ring R. =2.= The body B of the grenade carries the lyddite charge G. The wood block E is put into the recess in the cup H, and the cup, wood block, and body are then firmly secured together by means of the three brass screws J. Attached to the wood block E is the cane handle D, to the end of which is securely bound the tail F, the cane handle D being for the purpose of throwing the grenade, and the tail F to steady it in flight and to assist to make it travel and fall point foremost. =3.= The upper part of the body has a groove M formed in it for the purpose of securing the cap A in position. The groove M is provided with four leads into it, two N.N., to allow of the insertion and removal of the cap, and two O.O., to allow the cap to move forward upon the grenade striking the ground or other obstacle. Two projections, e.e., are made in the groove M for the indent X in the cap A to jump when the cap enters or leaves the travel position. One projection is to be made long enough to carry the indent into the _Fire_ position. The object of these two projections is to give a definite indication of when the cap is in the _Travel_ and _Fire_ positions. Two indicating knobs P.P. are secured to the body, and two stop pins Q.Q. are fixed below the indicating knobs P.P., preventing the cap A being pushed down too far (except when turned into the _Fire_ position--see later) if by any accident the safety-pin had been removed or displaced. Fixed to the top of the body are two holding studs R.R. to secure the detonator C when in position. The body has also painted on it in red two arrows L.L. for the purpose of indicating positions of cap A as to the removing, travel, or firing positions. =4.= The detonator C is formed with a flange S on which are two lugs T.T. for the purpose of turning the detonator when in position, so as to secure it under the heads of the holding studs R.R. On the face of the flange S is fixed a brass plate spring U, for locking the detonator into position. The two grooves V.V. in the flange S of the detonator C are to allow the flange S to pass the holding studs R.R. during insertion or removal of the detonator. [Illustration: =Fig. 52=.--HAND GRENADE (MARK I). Scale ⅓] =5.= The cap A carries a steel needle W for firing the detonator. Two small indents X.X. are formed on the cap to engage with the groove M on the body B. The raised lips I.I, are to allow the cap A to clear the indicating knobs P.P. when the cap is being placed or removed from the body of the grenade.