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August, 1909 AREA OF WATER PLANES. Nos. of Half a ordinates. ordinates. Multipliers. Products. it 30 1 30 2 30 4 120 3 30 2 60 4 30° 4 120 5 30 1 30 360 58.5 19.5 $e 2 faer plane area in Sq. iti. 3.6.05 14,040 The above table shows the method of calculating the area of the water plane as the load water line. This section is a rectangle and can be calculated by multiplying the length and breadth together, 60 X 234= 14,040, which is the same result as above. This being only the square feet of top surface or area of plane the cubical contents have to be found. This is done by putting the area of the planes under the same process. Ex.: CUBICAL "CONTENES: No. of areas. Areas. Multipliers. Products, 1 14,040 1 14,040 2 14,040 4 65,160 3 14,040 2 28,080 4 14,040 4 56,160 5 14,040 2 28,080 6 14,040 4 56,160 7 14,040 2 28,080 8 14,040 4 56,160 9 14,040 2 28,080 10 14,040 4 56,160 11 0 1 0 407,180 2 A = ------- 8 3)814,360° 271,453 cu. Et. The water planes are all the same except the bottom 11 which rises 3 in. A half ordinate should be put in between 10 and 11, but this is near enough as an example for the meas- urement of register tonnage. The only thing to be considered in this calculation is the loss of area caused by the rise of floor and bilge rounding, which could be arrived at by a certain percentage to the box form. Example: 234 X 60 X 20 X 0.96 = 271,453 cu. ft Four per cent is the loss in rising the bottom and rounding the bilge, compared to a box shape. The ends are formed so that the entrance and exits may be easy, in TAE Marine REVIEW afi Fig. which case the above calculations will be found correct. .. In calculating the gross tonnage of a vessel in this example the length would be divided into 16 parts and the depth into. six. Referring to Fig, 55 the tonnage is measured from the tank top to the height shown, 27 ft. 2 in, and width 57. "An act to amend section one of chapter 398 of the laws of 1882, en- titled 'an act to provide for deduction from the gross tonnage of vessels of the United States.' "Be it enacted by the senate and house of representatives of the United States of America, in congress assem- bled, that section one of chapter 398 between the hoppers 45 ft. to the of the laws of 1882, approved Aug. 5, height of- the side tank. Above the 1882, entitled 'an act to provide for 2 3 y: G a a 3 a / Fic. 58. side tank the width would be taken frame which Fig. 60 to the outside of the would be treated separately. a copy of the ship's certificate. of register which shows two kinds of register, gross and net, is not repro- duced in this article. The net tonnage is the principle on which taxation is based and will be best illustrated by printing the act passed in the year 1895. Chap. 173: deductions. from the gross tonnage of -- vessels of the United States' be amend- ed so as to 'read: "That section 4,153 of the - revised statutes of the United States be amend- ed by inserting before the last para- graph thereof the following words: 'That from the gross tonnage of every vessel of the United States there shall be deducted--(a) The tonnage of the Fig 59.