A common form of garden pump used for spraying flowers and fruit is shown in the accompanying illustration. It is simply a brass tube with three rings soldered, or rather sweated, on the outside to stiffen the tube. This forms the barrel; a fine thread is usually chased on the bottom to screw into a shorter piece of tube that forms the valve box. To this is soldered a very much smaller piece of tube to connect with the top valve and air vessel. The air vessel consists of two tubes,- the outside piece is of the same bore as the barrel, and is strengthened in the same way. A disc-like piece is fastened to the top, through the centre of which a much smaller pipe runs. The space between the two pipes forms the air vessel, a large one. These pumps are made with brass valves, but leather ones are better. The plunger is an ordinary cup leather. Sometimes two pumps are put back to back. Usually two 3)-ft. lengths of hose pipe are attached to these pumps.

Making a Garden Pump.