1
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I had gone over the ground with the captain of the Engineers of the rifles which were set up on the supports with the four gallon biscuit tins.

2
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They were capable of holding four gallons of water and these were put on little extra supports, one above the rifle and one below the rifle. The one above the rifle had a hole drilled in the base with a plug in it.

3
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The one below was empty but it had a string strung over a screw in the butt, which again was turned over and tied onto the trigger. And the point was that the tin above having water in it had over seven pounds,

4
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that when you pulled the plug in the base it poured into the tin below and when the tin filled up to seven pounds or thereabouts the pressure was enough to pull the trigger and that set the rifle off.

5
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Now these tins above had holes of different sizes, so according to the speed at which the water fell out, the shots rang out intermittently and at spaced times.

6
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We also had Very lights fitted up in much the same fashion, so that they went off. And then we had braziers which were hooded and in which had clips of ammunition suspended above them and candles which,

7
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when they burn through threads, let the braziers drop in and they created a bit of a din in the brazier.