This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
The sketch shows how to place an ordinary sponge in a pump spout, to filter out sand and dirt particles that may come up with the water as it is pumped. A wire is fastened in the sponge so that it can be easily taken out for washing. When washing the sponge give the pump handle a few strokes so that the dirt collected in the spout will be washed out. Do not press the sponge too tightly into the spout, as this will stop the flow of water. - Contributed by Chas. Home-wood, Waterloo, Iowa.