66/123 It was blown by compressed air. After many failures, I eventually succeeded in bringing it to such perfection that in 7 1/2 minutes it would bring four ounces of steel into a perfectly liquefied state. I next commenced the study of electricity and magnetism; and then acoustics, light, and heat. I constructed all my apparatus myself, and acquired the art of glass-blowing, in order to make my own chemical apparatus, and thus save expense. I constructed various scientific apparatus--a syren, telephones, microphones, an Edison's megaphone, as well as an electrometer, and a machine for covering electric wire with cotton or silk. |