48 ENOINKS.—KNORA VI NG. 



Id'io-Elec'tric. — Electric per se, or containing electricity in its 

 iiatuiiil .state. 



Induc'tion. — Ai\ influence exerted by an electrified body 

 tliroiiuli a non-conducting raediuui without apparent 

 communication of a spark : thus electrical attractions and 

 repulsions may be transmitted by induction through glass, 

 although no spark can pass througli such a medium. 



Insula'tion. — In electrical experiments^ the act of placing elec- 

 trified bodies, by means of non-conductors, in such a situa- 

 tion that the electricity is prevented from escaping. 



Insula'tor. — The substance or body that insulates ; a non-con- 

 ductor. 



Magnetics. — The science ov principles of magnetism. 



Magnetism. — That branch of science which treats of the 

 pr(i)>erties of the iiKignet. 



Magnetiza'tion. — The mode by which magnetism can be com- 

 municated to a bar or mass of steel or iron. 



Magnetom'eter {magnet, and Gr. metron, measui'e). — An in- 

 strument to ascertain the force of magnetism. 



Thermo-Electricity (Gr. therme, heat). — Electricity developed 

 by the unequal distribution of heat through bodies. 



Thermo-Mag'netism (Gr. therme, heat). — Magnetism as af- 

 fected or caused by the action of heat. 



Voltam'eter, — An instrument for measuring the intensity, etc., 

 of an electric current. 



Zinc'ode. — The positive pole of a galvanic battery. 



ENGINES. 

 En'ginery. — The art of managing engines. 



ENGRAVING. 



Engrav'ing. — The art of producing figures or designs on metal, 

 etc., by incision or corrosion, for the purpose of being sub- 

 sequently printed on paper. 



Anaglyptog'raphy (Gr. anagluplw, 1 describe, and grapho, I 

 write). — The art of copying icorhs in relief hy a process 

 of machine-ruling on an etching-ground, which gives to 

 the subject the appearance of being raised from the surface 

 of the paper, as if it were embos-sed. 



