The machinery, also made by Earle s Company, consists of a set of triple-compound three-crank engines, having cylinders 22in, 35in, and 57in diameter, with a stroke of 42in, and two steel single ended boilers, 14ft 3in mean diameter by 11ft inside length at top, made in accordance with Lloyd s and the Board of Trade requirements for a working pressure of 170lbs per square inch.
42.
Armed with a microscope, the most consistent observable difference between " A . onopteris " and " A . adiantum-nigrum " is that " A . onopteris " spores have a mean diameter of 28 ?m and are almost all smaller than 31 ?m, whereas those of " A . adiantum-nigrum " have a mean diameter of 34 ?m and are almost all larger than 31 ?m.
43.
Armed with a microscope, the most consistent observable difference between " A . onopteris " and " A . adiantum-nigrum " is that " A . onopteris " spores have a mean diameter of 28 ?m and are almost all smaller than 31 ?m, whereas those of " A . adiantum-nigrum " have a mean diameter of 34 ?m and are almost all larger than 31 ?m.
