Fig. 2. a remarkably simple, convenient and durable coal The principal object of this invention is to prevent sifter recently patented by W. B. Wadman, of Boston, the mattress from becoming compressed and flat- Mass. tened in some portions more than in others; this It consists of three parts which… … during the week previous; thus giving a correct history of the progress of inventions in this country. We are also receiving, every week, WADMAN'S COAL SIEVE. the best scientific journals of Great Britain, France and Germany; thus barrel or cylinder, in which the sieve Fig. 2 fits the mattress…
