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. [Illustration] 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. [Illustration] 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. Treated in this manner your cork will fit, and close the bottle hermetically. The Fusee Rocket. For this you only want a simple match box. Take out a match, and holding it on to the box as shown in figure, _i.e._, hold the box a little slanting, between the thumb and forefinger, and place the match head downwards on the side of the emery paper, where the match ignites when rubbed against. With medium force press on the match and with the other hand give it a fillip in the direction indicated by the arrow. The little missile will fly into the air all ablaze, and fall down at a distance of four, five, or even six yards. With a little practice you will succeed each time. It looks like a small rocket, especially when done in complete darkness. [Illustration] Be careful to make the experiment only where there is no danger of setting anything on fire. A Novel Table Mat. To construct this original table mat 6 objects, always at hand when table is laid for a meal, are required; 3 knives and three tumblers of equal size and arrange the tumblers upside down, in the form of a triangle, and on each of them rest the handle of a knife. Cross the blades so that the first laid passes over the second and the second over the third, this latter passing over the first X. [Illustration] The blades sustain themselves and you may place on them a dish or any other heavy object, without being afraid of a collapse. The arrangement is sufficiently shown in the design with out requiring more detailed explanation. Geometrical Paper Band. Take a band of paper, say a postal wrapper; you observe that it has two lines and two surfaces (interior surface and exterior surface.) The problem is to arrange it so that it presents only one line and one surface. It may seem improbable, yet it is possible as you will see. Cut the band and gum together again the two pieces thus separated, after having turned over one of them as shown in figure as above. Arranged in this manner the paper has but one line and one surface, for it has the aspect of a screw without end. [Illustration] Photographic Camera. Here is a simple way to construct a camera for a pocket photographic apparatus. [Illustration: Fig. 1.]