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 handle of the cover, instead of being attached to the center, is placed near the edge and bail of the pail. On the bail and just above the handle of the cover there is formed a loop large enough to accommodate the thumb.
Ill: the Bail Loop and the Handle Make It Easy to Remove the Cover with One Hand
With this arrangement, the cover may be removed with the use of but one hand.