A delicate test of balancing may be attempted with the shovel and tongs. The position of the two implements is shown in the illustration Fig. 20. The extremity of one arm of the tongs is rested against the inside of the shovel, and the other extremity is placed in the angle formed by the junction of the shovel with the handle. By delicate poising the two may be induced to remain in equilibrium in the position illustrated. A formation which permits of the tongs being engaged with the shovel after the manner shown is an important factor. [Illustration] 21.--A TOWER OF GLASS. [Illustration] An effective combination is shown in Fig. 21. A carafe, partly filled with water to give stability, forms the basis of the structure. Upon this a trio of wine-glasses, lying horizontally, are arranged, and so held while the bottle, half filled with water, is placed in position above them. A little careful adjustment will secure an accurate reproduction of the experiment as illustrated. 22.--ANOTHER ARRANGEMENT. [Illustration] A similar structure, formed with seven glasses and a carafe, is shown in Fig. 22, which is self-explanatory. 23.--THE REVOLVING COIN. [Illustration] A simple experiment for impromptu performance at the table can be made with a couple of pins and a coin. The accomplishment consists of picking up the coin by two opposite edges between the points of the two pins, as in Fig. 23, in which position it may, with steady hands, safely be held. By blowing smartly upon one edge of the coin it may be made to rapidly revolve between two points. The feat has the appearance of an exhibition of considerable skill, but, as a trial will show, it is in no way difficult of execution. The selection of a milled-edged coin will facilitate the matter. 24.--AN EXTEMPORIZED TRIPOD. [Illustration] With three forks, a serviette ring, and a plate, one may improvise a stand for a soup tureen or water carafe. The forks are merely passed through the ring and spread into the form of a tripod, the handles resting upon the table. A plate placed upon the prongs of the forks locks the whole and provides the necessary rest for the article to be supported. The fruit dish in the illustration happens to be of just the right size to rest in the support formed by the extremities of the forks, the plate being in this case unnecessary. 25.--KEYS TO EMINENCE. [Illustration]