Making use again of the basting-ladle, a cork is first fixed into the hook of the handle, and into this is thrust the point of a knife or the prongs of a fork, the latter being at an angle of about 45deg. or so to the former. A glass is filled with water, and by placing the fork or knife-handle upon the edge of the glass the ladle will balance as in Fig. 12.
By still another application of the basting-ladle, or a walking-stick or umbrella, a bottle may be balanced upon a slack cord. All that is necessary is to insert the hook of the ladle-handle or the handle of the stick into the neck of the bottle and support upon the cord, as shown.
Bend up a piece of stiff wire, such as a hairpin, into the shape shown in the lower right-hand corner of Fig. 14, with a hook at one end and a clip at the other, the latter adjusted to grip a coin tightly. By hanging a fairly heavy finger-ring upon the hook as a counter-weight, the whole may be balanced with the penny upon the point of a needle, and made to revolve on it.
A similar experiment may be performed on a larger scale by bending up a longer and proportionately stouter piece of wire, and substituting for the coin a small plate and for the ring a bunch of keys--Fig. 15--or a larger plate and a tea-cup. In the latter case the weight of the tea-cup may be built up to counter-balance the plate by dropping a number of coins one by one into the cup until the required weight is obtained.
This experiment is not a case of pure balancing, but depends principally upon the nice adjustment of the two pieces of stick by means of which the position of the two glasses is maintained. A couple of slender pen-holders may be used, and must be trimmed down at the ends until the right length is obtained. The position of the sticks and the manner in which the glasses are supported can best be gathered by a study of the illustration below.
Simple methods of balancing a milk-jug and tea-cup respectively are shown in Figs. 17, A and B. In the first illustration the cork is placed inside the handle of the vessel, in which position it should fit with moderate firmness, so as not to slip, and then two knives are thrust in, one from each side of the handle, between the cork and the cup itself, when the cup may be balanced upon any fixed point. In the second a cork is fixed into the handle, as before, and into the cork the prongs of a fork are fastened, holding the fork in such a position as to bring the centre of gravity below the point of suspension. The cup may then be balanced as before.