Any scientific engineer can calculate the thickness of a cylinder or diameter of a connecting rod necessary to resist the force they have to resist, but the disposition of the frame becomes difficult when the action of dead weight, and the various pressures produced by the working of the engines are complicated through the motion of the ship herself, which alters their modes of action. The usual practice had been to sustain the engines by a frame so massive as to present ten times the strength necessary, and accordingly a useless and costly weight took permanently the place of cargo: but in the engines of the _Pacific_, the difficulty was completely overcome: two large hollow pillow-blocks which sustain the paddle-wheel shafts on each side of the cranks were supported in each engine by four wrought iron columns on the forward extremity of the bed plate, the centre of the shaft being 23 feet above the keelson. The pillow-blocks thus supported were connected by two strong inclined braces to the cylinder, by means of solid facings cast with it, on each side of the steam opening. To maintain this skeleton, a number of braces, small in appearance, were so disposed as to effect the purpose. No expense having been spared to render the ships of the Collins Company complete in all respects, the cost so far exceeded the estimates that the government found it necessary not only to make an advance to the company, while the vessels were in course of construction, but also to relieve them from their obligation of building a fifth vessel as originally contemplated, and to increase the subsidy from $19,250 to $33,000 per voyage, or to the sum of $858,000 (about 178,750_l._) per annum. _But increased rates of speed were required in return._ [Sidenote: Cost of steamers greatly increased by demand for increased speed.] There seems an almost insane desire for increased speed in locomotion by land and by sea, especially by persons who are not aware, or who do not consider that high speed involves increased danger, and greatly increased cost in ocean navigation. The attainment and maintenance of high speed depend upon the exertion of a high power. High speed and power require stronger parts in everything: in the materials for the ship’s build, the boilers, the machinery, and in all the working arrangements. High speed and power demand a larger outlay in prime cost for the adequate resistance required by such power, and lead to more frequent and costly repairs. High speed and power need more watchfulness, more prompt action, and consequently more persons, whether engineers, firemen, or coal-stokers; moreover, they cause the consumption of more fuel.