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What will the above tonnage amount to, at 16 dols. per

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3. Required the tonnage of a ship of 74 feet keel, and 26

feet 6 inches beam?

Ans. 273 tons.

To find the Government Tonnage.

"If the vessel be double-decked, take the length thereof from the fore part of the main stem, to the after part of the stern post, above the upper deck; the breadth thereof at the broadest part above the main wales, half of which breadth shall be accounted the depth of such vessel, and then deduct from the length, three-fifths of the breadth, multiply the remainder by the breadth, and the product by the depth, and divide this last product by 95, the quotient whereof shall be deemed the true contents or tonnage of such ship or vessel; and if such ship or vessel be single-decked, take the length and breadth, as above directed, deduct from the said length three-fifths of the breadth, and take the depth from the under side of the deck plank, to the ceiling in the hold, then multiply and divide as aforesaid, and the quotient shall be deemed the tonnage."

EXAMPLES.

1. What is the government tonnage of a single-decked vessel, whose length is 69 feet 6 inches, breadth 22 feet 6 inches, and depth 8 feet 6 inches?

ft. in.

69 6 length,

22 6 breadth

deduct 13 6 for 3 breadth. 3

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2. What is the government tonnage of a double-decked vessel, of the following dimensions; length 75 feet 6 inches, breadth 23 feet 4 inches, and depth 11 feet 8 inches?

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3. What is the government tonnage of a double-decked vessel, of the following dimensions; length $2 feet 3 inches, breadth 24 feet 3 inches, and depth 12 fect 14 inches?

Ans. 20993 tons.

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TABLES OF CORDAGE.

A CORDAGE TABLE, shewing how many fathoms, feet, and inches of a rope, of any size, not more than 14 inches, make a hundred weight; with the use of the table.

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At the top of the table, marked inches, fathoms, feet, inches, the first column is the thickness of the rope in inches and quarters, and the other three the fathoms, feet, and inches that make up a hundred weight of such a rope. One example will make it plain:

Suppose you desire to know how much of a seven-inch rope will make a hundred weight: Find 7 in the third column under inches, or thickness of rope, and against it in the fourth column you find 9 5 6, which shews that there will be 9 fathoms 5. feet 6 inches required to make one hundred weight.

A TABLE, shewing the weight of any Cable or Rope of 120 futhoms in length, and for every half inch, from 3 to 24 inches in

circumference.

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The first column marked for inches, is the thickness or circumference of the cable to every half inch from 3 to 24 inches; the second, marked cwt. qrs. for the hundred weights and quarters that it will weigh, if 120 fathoms in length.

For instance: Suppose it be a cable of 14 inches; look against 14. and you will find in the other column 52cwt. 2 qrs, which shews that 120 fathoms of 14 inch cable will weigh 52cwt. 2qrs. and so in others: and any quantity of a less length will weigh in proportion.

A ship was brought to anchor in a gale of wind, but the gale increasing, it was thought safest to cut the cables, in consequence of which 75 fathoms of 16 inches, and 50 fathoms of 12 inches were lost; what must they be valued at in calculating the average; new cordage being then 14 dollars per cwt ?

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