146

A LIST OP THE PRINCIPAL

seen iii a pleasing manner at all the intersticesbetween the spots of tin-foil.

Small round pieces of tin-foil are sometimesfixed on flat pieces of glass disposed into various fi-gures, one side of the glass is painted with differenttransparent colours; the spark seen through theseappears of the colour through which it is seen.

Fig. 32, a luminous word acting upon the sameprinciples; the word is formed by small separa-tions made in the tin-foil; a chain is to be sus-pended from the hook, h; the ball, G, is to be.presented to the conductor, so as to take sparkstherefrom.

Fig. 33, a conductor, with ladle, I; shewingthe manner in which spirits of wine or inflamma-ble oils may be fired by the electric spark.

Fig. 34, the electrical flyer; it consists of twosharp-pointed wires, joined at the center; theends of the same wires are bent contrary ways;the center at K is a small concavity, that the flyermay be placed on the pointed end of the wire, L;the wire, L, is to be placed in one of the holes onthe top of the conductor; when electrified, theflyer will turn with as much velocity as the flyer

of a common jack.

Fig. 35 , represents a similar flyer, acting in adifferent position, the axis being at right anglesto the flyer, with two small pullies, one at eachend of the axis; the. wires, M N, O P, should