Quadruple expansion steam engine driving two screw propellers. The ship could generate 658 n.h.p. with a speed of 12 knots thanks to her two double boilers, two single boilers and 18 corrugated furnaces.
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Weisshaar 1988, p. 249. Commercial glue pots, simple water baths or double boilers may be used to keep the glue hot while in use. As hide glue cools, it gels quickly. At room temperature, prepared hide glue has the consistency of stiff gelatin, which is in fact a similar composition.
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The engines of the Rotterdam were two separate quadruple expansion engines generating 14,000 ihp. Steam was provided by two single and eight double boilers heated by 54 fires. The designed speed was 16.5 knots. The quadruple expansion was realized by cylinders of 33, 47, 68 and 97.5 inch diameter with a 60-inch stroke.
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Hindenburg was propelled by four sets of steam turbines driving four screws; steam was provided by 14 coal-fired marine-type double boilers and eight oil-fired marine-type double- ended boilers. The propulsion system was rated at for a top speed of . At a cruising speed of , she had a range of . Hindenburgs primary armament was eight 30.5 cm (12 in) guns in four twin turrets, the same as in her two sisters.
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A much larger follow-on contract was awarded in March, 1941 for ladles, skimmers, turners and spoons. With war imminent, Vollrath gradually converted to war production in late 1941, increasing the government supplies until August 1, 1942. At that time, Vollrath was working 100% on defense work, which continued throughout the war. By September 1943, Vollrath's price list of porcelain enamelware permitted for civilian use was strictly limited to a few dozen necessary items such as coffee pots, boilers, and percolators, vegetable insets, bain maries, double boilers, dish pans, ladles, pails, hotel pans, sauce pans, and stock pots for kitchen use.
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Mason's idea was to remove what American railroad men saw as the biggest disadvantages of the Fairlie - its cramped space for fuel and water caused by its double ended design (not very useful on American railroads where there was always ample room for a turntable or wye), its cramped cab caused by the joined double boilers, and to some degree its poor riding. He did this by removing one boiler of the double Fairlie and retaining only one power truck at the front. A much larger cab was fitted, and a fuel bunker and water tank behind the cab, supported by a trailing truck. The advantages of the Fairlie design were kept; the swivelling driven truck for a greater ability to negotiate curves, and the large open space between the trucks to fit a large firebox unrestricted by the wheels.
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