Its action is strongest when the air holes of the lamp are fully open.
His eye was fixed on the air holes, with which the pipes communicated.
But as it was full of air holes it didn't make a very competent parachute.
Each of these air holes was about twenty inches square, and fastened by cross-bars to prevent escape.
Rosie thrust her hands among the onions and cabbages and drew out a small pasteboard box generously pierced with air holes.
"When you're skating, you want to look out for air holes," was John Barrow's caution.
The usual size is 31 inches, and should be of a good quality of glass, free from scratches or air holes.
A Bessemer converter is actually a big retort with air holes at the bottom where molten iron is purified into steel with air.
I was obliged to cross a lake, known to have air holes probably caused by warm springs.
They also have air holes covered very cunningly two or three inches deep on the way to the bank and water.