derable practical science involved in the construction of chimneys. It is well known that many of them smoke and the plague of a smoky Fig. l isa metallic disk (brass is generally pre- chimney is put in the same category with“‘a scolding ferred, as being sufficiently elastic without liability to… … * dry. The construction theyhave been connected with its publication, Fg. 1. ig. 4. of piston also insures a constantly water-tight joint, To the Inventor ! and most practical of our philosophers, Franklin, without the necessity for tight packing, always ob- The SCIENTIFIC AMERICAN is indispensable…
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