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.
Quite frequently the cook or housewife wishes to pour the hot water or liquid from boiling vegetables or other foods without removing the solids from the kettle. This is easily accomplished, if small holes are drilled in the cover as shown in the sketch. The saucepan or kettle can be tilted and the liquid drains through the holes. Further, the steam from cooking food can readily escape through the holes, thus preventing the cover from vibrating, or the liquids from boiling over.
Ill: A Sufficient Number of Holes are Drilled in the Edge of the Cover to Make a Strainer