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662.-Table I. Of the Properties of the Steam of Water of different Degrees of Elastic Force.

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The mode of obtaining the first five columns is obvious; and in the fourth and fifth the negative sign indicates that the force of the steam is less than atmospheric pressure, and the numbers shew how much less: the sixth column is calculated by (art. 89,) the seventh by (art. 121,) and . from it the eighth and ninth: the tenth column is calculated by the equation in the note to (art. 136,) with the allowance for contraction of the aperture; and the last column is obtained in the manner shewn in the note to (art. 190.)

*The usual force of low pressure steam.

Example. If the breadth be thirty-two feet, the length 162 feet, and the length of the engine room forty-seven feet,

[blocks in formation]

The register tonnage is the same whether the draught of water be seven feet or fourteen feet; and it is the same whatever may be the form of the vessel: now it is an unpleasant task for an Englishman to mark as fallacious the modes of measuring the capacity of vessels adopted by his Government, but it is necessary for the purposes of science not only that it should be pointed out, but that the error should be corrected.

662.-Table I. Of the Properties of the Steam of Water of different Degrees of Elastic Force.

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The mode of obtaining the first five columns is obvious; and in the fourth and fifth the tive sign indicates that the force of the steam is less than atmospheric pressure, and the numbers shew how much less: the sixth column is calculated by (art. 89,) the seventh by (art. 121,) and . from it the eighth and ninth: the tenth column is calculated by the equation in the note to (art. 136,) with the allowance for contraction of the aperture; and the last column is obtained in the manner shewn in the note to (art. 190.)

The usual force of low pressure steam.

663.-Table II. Of the Proportions of single acting steam engines equivalent to different numbers of horses; the horse power being 33000 pounds raised one foot high per minute, and the elastic force of the steam in the boiler 35 inches of

mercury.

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664.—Table III. Of the Proportions of double acting Steam Engines equivalent to different numbers of horses; the horse power being 33000 pounds raised one foot high per minute, and the elastic force of the steam in the boiler = 35 inches of mercury.

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