able practical science involved in the construction of chimneys. It is well known that many of them smoke and the plague of a smoky Wmfi Fig. 1 is a metallic disk (brass is generally pre- chimney is put in the samecategory with" a scolding ferred, as being sufficiently elastic without liability to… … dry. The construction theyhave betm connected with its publication. Fig. 1. Fig. 2. Fig. 3. Fig. 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…
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