Gear's illustrated catalogue of wood and iron working machinery (1872)
A.S. Gear, Gear, A. S · Boston : Printed at A.S. Gear's printing office, 62 Sudbury Street · leaf 438
of 1J lbs. or more. No well constructedcupola will work well with more than IJ lbs. pressure, and this can be had with lesspower with the single Sturtevant wheel than with two or three wheels. 1 lb. blastis good for 30 tons to a heat in one cupola. Double and triple Blowers are morecomplicated and… … 2 ^ 3 CD O 4J ■ - C 55 1 CO g 1 cCo o 4-5 O o IE p 1 > o Cj 1 St-. O c ^ % ai 1 A -M CO o 3 CO s o C u ■•-> c 0) to ^ h s >^ u 0 , t)L ^ (3 a> V ^^ •^ tw ■3 rt a. k J ■f. n O C (D > >> i -*j -♦J CO a ■^ 4J in 00 a c& _c33 o a 5 3 0r4 10 5 bB g 3 o s o 1 a .3 o CO 3 c (0 c…
