On either side of the furnace two household fire machines were placed in order to generate more heat. A short pipe was then placed from these machines into the furnace approx 1 foot from the bottom. The normal wheels were taken off these and two wheels off furze machines were used so there would be sufficient air blast to generate the heat needed. These wheels were approx 4 feet in diameter. A big pulley was then inserted at the foot of the machine and a belt placed from those right around the wheels of the furze machines. This meant that the big wheel of the furze machine was driving the small wheel so that great speed was achieved.
A small oven was then placed in the corner of the dug out which also had a pipe to allow smoke out. This oven was used to bake the cores for making the bombs. Chills (which is pictured below) were also needed for the moulding and making of bombs. The chills were in two parts, it is a block of iron approx 9 inches long by 5 inches wide by 4 inches deep. One half of these chills were fixed permanently to a sleeper on the side of the factory. The other side fitted in over the bolt and would have been kept in place using a pin. In the factory there was also a ladle which was used for pouring the molten material into the chills. The ladle had a three foot iron handle with a ring on one side, into which was places a metal pot which could take approx 1 gallon of liquid and had a spout for pouring. The operating of the factory took six men, one on each fir machine, one placing the cores in the chills, one tapping the barrel into the chills and a man for sealing the furnace when the ladle was full. In one night it would have been possible to make ninety bomb castings.
