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Appendix
375
to find the tonnage, three fifths of the breadth were deducted from the length and the remainder multiplied by the breadth, and this product multiplied by one half the breadth, or the assumed depth, the last product was then divided by 95, giving the formula:
Thus in a vessel measuring 100 ft. x 20 ft. x 18 ft.:
| Length of vessel … | 100 |
| Subtract 3⁄5 breadth … | 12 |
| Length for measurement … | 88 |
| Multiply by the breadth … | 20 |
| 1760 | |
| Multiply by half breadth … | 10 |
| 17,600 | |
| Divide 17,600 by 95 … | and |
| the result is … | 185+12⁄19 |
| Total tonnage … | 185+12⁄19 |
This mode of measurement continued from colonial times until the Moorsom system was adopted in 1865.
The dimensions of ten representative American and British clippers were as follows:
| Length | Breadth | ||
| Nightingale (1851) | 178 " | 36 " | |
| American | Oriental (1849) | 183 ft. | 36 " |
| Celestial (1850) | 158 " | 34 " 6in. | |
| Stag-Hound (1850) | 209 " | 39 " | |
| Flying Dutchman (1852) | 187 " | 38 " 6in. | |
| British | Falcon (1859) | 191 " 4in. | 32 " 2in. |
| Taitsing (1865) | 192 " | 31 " 5in. | |
| Titania (1866) | 200 " | 35 " | |
| Spindrift (1867) | 219 " 4in. | 35 " 6in. | |
| Thermopylæ (1868) | 210 " | 36 " |
