| Grains. | ||
| Water | 964·74372 | |
| Chloride of | Sodium | 27·05948 |
| " | Potassium | 0·76552 |
| " | Magnesium | 3·66658 |
| Bromide of | Magnesium | 0·02929 |
| Sulphate of | Magnesia | 2·29578 |
| " | Lime | 1·40662 |
| Carbonate of Lime | 0·03301 | |
| 1000·00000 | ||
SEA-WAY. The progress of a ship through the waves. Also, said when a vessel is in an open place where the sea is rolling heavily.
SEA-WAY MEASURER. A kind of self-registering log invented by Smeaton, the architect of the Eddystone lighthouse.
SEA-WEASEL. An old name of the lamprey.
SEA-WOLF. The wolf-fish, Anarrhicas lupus.
SEA-WOLVES. A name for privateers.
SEA-WORTHY. The state of a ship in everyway fitted for her voyage. It is the first stipulation in every policy of insurance, or other contract, connected with a vessel: "for she shall be tight, staunch, and strong, sufficiently manned, and her commander competent to his duty." (See [Opinion].)
SEA-WRACK GRASS. Zostera marina; used in Sweden and Holland for manuring land. At Yarmouth it is thrown on shore in such abundance that mounds are made with it to arrest the encroachments of the sea. It is also used as thatch.
SECANT. A line drawn from the centre of a circle to the extremity of the tangent.
SECCA. A shoal on Italian shores and charts.