Thewell-known form of ear-trumpet, consisting of a long,flexible tube, with a small trumpet opening, which theafflicted person holds near the mouth of the speaker, isa more powerful conductor of sound; but all these con-trivances are so inconvenient as to be frequently rejected.It is to Dr. Arnotts… … THE ORIGIN OF OUR CAST IRON INTENTION AND DISCOVERY. THE OEIGIX OF OUR CAST-IRON. ABRAHAM DAEBY AND THE SHEPHEKD-BOY SECHETLY CASTING THE IRON POT. The cast-iron whicU comes from the blast-furnace may,from its useful quality of fusibility, be immediately used,as every one knows, for manufacturing…
Inventions
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