88 - REGORT—1857. 
ties, set off on a horizontal scale of 10 tons to the quarter-inch, at their 
respective heights on a perpendicular scale of quarter-inch to a foot, a curve 
run from the keel through the three, will form a scale or table upon the 
tounage displacement or weight of cargo carried.” 
Rule I.——Internal Measurement. 
2. Then the hold, being first sufficiently cleared to admit of the required 
depths and breadths being properly taken, find the transverse area of such 
ship 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 of the floor timber at the inside of 
the limber strake, after deducting the average thickness of the ceiling ; then, 
if the depth at the midship division of the length do not exceed sixteen 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 bilge planks and limber strake ; 
also marking at the end of each horizontal breadth measured, the average 
thickness of the side, ¢. e. ceiling, frame timber, and outside plank, from 
which to compute the external area of each transverse section ;” number 
these breadths from above (i. e. 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 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 deck exceed sixteen feet, 
divide each depth into six equal parts instead of four, and measure, as before 
directed, the horizontal breadths 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 seventh; multiply the quantity thus obtained by one-third of the com- 
mon interval between the breadths, and the products shall be deemed the 
transverse area. 
3. Having thus ascertained the transverse area at each point of division 
of the length of the ship as required by the above table, procced to ascer- 
tain the internal space of the ship in the following manner :—“ Number the 
areas successively, 1, 2,3, &c., No.1 being at the extreme limit of the length 
at:the bow, and the last No. at the extreme limit of the length at the stern ;” 
then, whether the length be divided, according to the table, into four or 
twelve parts, as in classes 1 and 5, or any intermediate number, as in classes 
2, 3, and 4, “ multiplying the second and every even-numbered area by four, 
and the third and every odd-numbered 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 quantity thus obtained by one-third of the 
common interval between the areas: record the product thus ascertained in 
cubic feet as the internal space under the tonnage deck. 
To compute Register Tonnage. 
“ Add together the external bulk to the medium height of tonnage deck, 
and the internal space under the tonnage deck in cubic feet; divide the sum 
by 2, taking the mean of bulk and space in cubic feet as the basis of re- 
gistered tonnage, to be deduced by the use of the factor °30, °3], or 32 
