560
OF ENGINEERING FORMULAE.
Tonnage of Vessels (New Measurement).
Divide the length of the upper deck between
the after-part of the stem and the fore-part of
the stern-post into 6 equal parts, and note the
foremost, middle, and aftermost points of division.
Measure the depths at these three points in feet
and tenths of a foot; also the depths from the
under-side of the upper deck to tlie ceiling of
the limber-strake; or in case of a break in the
upper deck, from a line stretched in continuation
of the deck. For the breadths divide each
depth into 5 equal parts, and measure the inside
breadths at the following points, viz.:—At ’2
and *8 from the upper deck of the foremost and
aftermost depths; and from '4 and -8 from the
upper deck of the amidship depth. Take the
length at half tlie amidship depth from the after-
part of the stem to the fore-part of the stern-
post.
Then to twice the amidship depth add the
foremost and aftermost depths for the sum of
the depths, and add together tlie foremast upper
and lower breadths 3 times the upper breadth
■with the lower breadth at the midship, and the
upper and twice the lower breadth at the after
division for the sum of the breadths.
Multiply together the sum of the depths, the
sum of the breadths, and the length, and divide
the product by 3500, which will give the number
of tons or “ register.”
• If the vessel has a poop or half-deck, or a break
in the upper deck, measure the inside mean
length, breadth, and height of such part thereof
as may be included within tlie bulkhead; mul-