When you think it is aimed straight, give it a fillip on the lower end, it will shoot up and touch the one placed on the glass if the aim be good.
If you succeed, you may congratulate yourself on having good eyes—a very desirable gift if you should have to handle a gun, as a soldier or a sportsman.
The Air-Tight Stopper.
How many times has it happened to you, when wanting to cork a bottle, that the intended cork was too large to enter the neck?
What have you done? Cut the cork all round, and obtained, but imperfectly, the desired end.
Next time when the same occasion arises, turn the difficulty in this way: Instead of attacking the sides, cut four notches, bevel-shaped, into the cork as shown in the figure.