(h)The space between the detaching hook referred to under clause (g), measured from the centre of the hole for attaching it to the rope shackle, and the detaching-bell or plate when the cage or other means of conveyance is at its normal position at the top of the shaft, shall be not less than 1.8 metres where a geared engine is used, and not less than 3.6 metres where a direct acting engine is used.
