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displaced by the Japanese advance on Shangjao. He also engaged some of the workmen from the Co-op. I was concerned not to have all our eggs in one basket, because I feared that should our efforts be too successful the Japanese would come and bomb us or send fifth column plain-clothes men to liquidate us. So we placed his workshop in another village. For raw material Reginald had the pieces of steel rail cut with explosives from our derelict line when practising with the students. From these he made all sorts of things. His chief output was knives, with which we had to equip all our students for cutting fuse, and other work. He also made screw-drivers, pliers, wire-cutters, crow-bars, and earth augers. The latter were heavy instruments with nine-inch cutting surfaces, that we used to cut holes in the earth. You could lay quite a good mine at the bottom of a six-foot deep nine-inch wide earth auger hole.
The chief instrument for cratering was however the light camouflet set. This was a metal tube of 2" diameter and 6 feet long, which was sunk into the earth by means of a hammer head that slid up and down inside. When driven in its full length one pulled the tube out and dropped in a small camouflet charge of 4 oz. of explosive; that blew a chamber of about a foot diameter at the bottom of the hole, sufficiently large to take a charge of 50 lbs. Ammonal was the best explosive for this type of cratering. We would pour the grey powder down the hole, gently ramming it with a wooden rammer, until the whole fifty pounds was well packed at the bottom, together with a primer from which a length of detonating fuse led out to the surface. We would then tamp the whole to earth level with mud, also gently rammed down, lash the detonator and safety fuse assembly to the detonating fuse and set the thing off. One could thus produce a crater up to thirty feet in diameter. This type of demolition, useful for mining at the back of bridge abutments and destroying them, took too much time and the instruments were too heavy and conspicuous to appeal much to our students.
Our second course finished in October, by which time we were beginning to run short of explosives and other supplies. Although the Japanese withdrawal from Shangjao had reopened communication with the rest of China, the destruction by the Chinese of all the motor roads to deny their use to the enemy, had prevented any further supplies reaching us. The first to come through were borne by junk and by coolie escorted by Jim, the missionary who had escaped from Shanghai, and who now rejoined us to help in administration. He brought us news of outside events. We learnt that it had been decided to wind up the main
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displaced by the Japanese advance on Shangjao. He also engaged some of the workmen from the Co-op. I was concerned not to have all our eggs in one basket, because I feared that should our efforts be too successful the Japanese would come and bomb us or send fifth column plain-clothes men to liquidate us. So we placed his work shop in another village. For raw material Reginald had the pieces of steel rail cut with explosives from our derelict line when practising with the students. From these he made all sorts of things His chief output was knives, with which we had to equip all our students for cutting fuse, and other work. He also made screw-drivers, pliers, wire-cutters, crow-bars, and earth augers. The latter were heavy instruments with nine inch cutting surfaces, that we used to cut holes in the earth. You could lay quite a good mine at the bottom of a six foot deep nine inch wide earth auger hole.
The chief instrument for cratering was however the light camouflet set. This was a metal tube of 2" diameter and 6 feet long, which was sunk into the earth by means of a hammer head that slid up and down inside. When driven in its full length one pulled the tube out and fropped in a small camouflet charge of 4 oz. of explosive; that blew a chamber of about a foot diameter at the bottom of the hole, sufficiently large to take a charge of 50 lbs. Ammonal was the best explosive for this type of cratering. We would pour the grey powder down the hole, gently ramming it with a wooden rammer, until the whole fifty pounds was well packed at the bottom, together with a primer from which a length of detonating fuse led out to the surface. We would then tamp the whole to earth level with mud, also gently rammed down, lash the detonator and safety fuse assembly to the detonating fuse and set the thing off. One could thus produce a crater up to thirty feet in diameter. This type of demolition, useful for mining at the back of bridge abutments and destroying them, took too much time and the instruments were too heavy and conspicuous to appeal much to our students.
Our second course finished in October by which time we were beginning to run short of explosives and other supplies. Although the Japanese withdrawal from Shangjao had reopened communication with the rest of China, the destruction by the Chinese of all the motor roads to deny their use to the enemy, had prevented any further supplies reaching us. The first to come through were borne by junk and by coolie escorted by Jim, the missionary who had escaped from Shanghai, and who now rejoined us to help in administration. He brought us news of outside events. We learnt that it had been decided to wind up the main
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