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Admiralty altitude angle axis azimuth Bay of Biscay boat bottom British cable Cachopo canal Captain centre Channel chart chronometer circle compass-card correct course curves dead reckoning deep-sea degree depth diagram diameter direction distance disturbance diurnal diurnal tide earth earth's surface eclipses equal equator error fathoms feet fixed light flashing light force friction harmonic harmonic analysis hauling hemisphere high water horizon inches instrument iron knots latitude length lighthouse longitude lunar magnetic poles mariner's compass meridian method minute moon motion nautical mile navigation nearly needle north magnetic pole object observation ordinary period position practical procession of waves reckoning resistance rise and fall round sailing seconds sextant ship side sinker solar sounding machine speed star steamer Straits of Dover terrestrial magnetism theory tidal tion true north turn velocity vertical vessel weather weight wheel William Froude
Popular passages
Page 118 - Nothing in these rules shall exonerate any ship, or the owner, or master, or crew thereof, from the consequences of any neglect to carry lights or signals, or of any neglect to keep a proper look-out, or of the neglect of any precaution which may be required by the ordinary practice of seamen, or by the special circumstances of the case.
Page 117 - If two ships under steam are crossing so as to involve risk of collision, the ship which has the other on her own starboard side shall keep out of the way of the other.
Page 118 - In obeying and construing these rules, due regard must be had to all dangers of navigation ; and due regard must also Le had to any special circumstances which may exist in any particular case rendering a departure from the above rules necessary in order to avoid immediate danger.
Page 117 - Every steam ship, when approaching another ship so as to involve risk of collision, shall slacken her speed, or, if necessary, stop and reverse ; and every steam ship shall, when in a fog go at a moderate speed.
Page 183 - Indian tide tables, do actually tell the height of the water for every instant of the twenty-four hours. The mechanical method which I have utilised in this machine is primarily due to the Rev. F. Bashforth who, in 1845, when he was a Bachelor of Arts and Fellow of St. John's College, Cambridge, described it to Section A of the 1845 (Cambridge) meeting of the British Association in a communication entitled " A Description of a Machine for finding the Numerical Roots of Equations and tracing a Variety...
Page 117 - Whenever there is a fog, whether by day or night, the fog signals described below shall be carried and used, and shall be sounded at least every five minutes, viz. : (a...
Page 437 - The catenaries concerned in these operations were illustrated by a chain with 15 per cent, of slack hauled up simultaneously at three points. The plan which seemed to the speaker surest and simplest is to cut the cable at any chosen point, far enough eastward of the present broken end to be clear of entanglement of lost buoy-rope, grapnels, and the loose end of the electric cable itself; and then, or as soon as possible after, to grapple and lift at a point about three miles farther eastward. This...
Page 192 - ... which have equal heaviness have equal inertia. The other point of the law of gravitation is, that the force between any two bodies diminishes as the distance increases, according to the law of the inverse square of the distance. That law expresses that, with double distance, the force is reduced one quarter, at treble distance the force is reduced to one-ninth part. Suppose we compare forces at the distance of one million miles, then again at the distance of two and a half million miles, we have...
