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110 THOMPSON'S COAST PILOT. a? measurement, is above two hundred feet, and not exceeding two hundred and fifty feet long, into fourteen equal parts. Crass 6. Vessels of which the tonnage length, according to the above measurement, is above two hundred and fifty feet long, into six- teen equal parts. METHOD OF FINDING THE AREAS. Transverse Areas.--Then, the hold being sufficiently cleared to admit of the required depths and breadths being properly taken, find the transverse area of such vessel at each point of division of the length as follows:-- Measure the depth at each point of division from a point at a distance of one-third of the round of the beam below such deck; or, in case of a break, below a line stretched in continuation thereof, to the upper side ofthe floor- timber, at the inside of the limber-strake, after deducting the average thick- ness of the ceiling, which is between the bilge-planks and limber-strake ; then, if the depth at the midship division of the length do not exceed six- teen feet, divide each depth into four equal parts; then measure the inside horizontal breadth, at each of the three points of division, and also at the upper and lower points of the depth, extending each measurement to the average thickness of that part of the ceiling which is between the points of measurement; number these breadths from above, (numbering the upper breadth one, and so on down to the lowest breadth ;) multiply the second and fourth by four, and the third by two; add these products together, and to the sum add the first breadth and the last, or fifth ; multiply the quantity thus obtained by one-third of the common interval between the breadths, and the product shall be deemed the transverse area; but if the midship depth exceed sixteen feet, divide each depth into six equal parts, instead of four, and measure, as before directed, the horizontal breadth at the five points of division, and also at the upper and lower points of the depth; number them from above as before; multiply the second, fourth and sixth by four, and the third and fifth by two; add these products together, and to the sum add the first breadth and the last, or seventh; multiply the quanti- ties thus obtained by one-third of the common interval between the'breadths, and the product shall be deemed the transverse area. METHOD OF ASCERTAINING THE REGISTER TONNAGE OF VESSEL. | Computation from Areas.--Having thus ascertained the transverse area at each point of division of the length of the vessel, as required above, pro- ceed to ascertain the register tonnage of the vesselgin the following manner: Number the areas successively, one, two, three, etc., number one being at the extreme limit of the length at the bow, and the last number at the extreme limit of the length at the stern; then, whether the length be divided accord- ing to table, into six or sixteen parts, as in classes one and six, or any inter- mediate number, as in classes two, three, four and five, multiply the second, and every even numbered area, by fowr, and the third and every odd num- bered area (except the first and last) by two; add these products together, and to the sum add the first and last, if they yield anything; multiply the