In lining with lead a wooden tank 20ft. by 9ft. by 4ft. deep, first divide the bottom of. the tank into three parts. This gives two seams across the bottom, and where the seams come the woodwork should be dished for the soldering to be wiped flush. The lead for each end of the tank can be in one piece, and if plenty of help is available, the sides could also be each in one piece. But if the tank is in a cramped position where the extra hands cannot exert their full strength, each of the sides can be lined with two pieces, dishings being made in the woodwork for flush seams to be wiped upright in the centre of their length. For rain water, the sides and ends should be of 7-lb. lead, and the bottom of 8-lb. lead; but if economy must be studied, 6-lb. lead sides and ends, and 7-lb. lead bottom, would do. To line the tank, first put in the sides, then the ends, and the bottom last of all. After the lead is in position, the upright flush seams and the upright angles should be soldered, then the bottom flush seams, and lastly the bottom angles. It is assumed that sufficient knowledge is possessed to arrange the laps so that the solder will not run through when wiping, and also to prepare the work for soldering.

Upright stiffening pieces wiped on to the sides are better than dots; but if it is found necessary to fix stay rods to keep the sides from bulging outwards, these rods would also help to support the lead, and prevent it from bagging as the tank is emptied of water.