A Manual of Scientific Enquiry: Prepared for the Use of Officers in Her Majesty's Navy; and Travellers in General |
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Page 15
... accomplished by using it to deflect a second magnet similarly sus- pended in another apparatus . The deflecting magnet is placed at one or more exactly measured distances from Sect . II . ] 15 TERRESTRIAL MAGNETISM .
... accomplished by using it to deflect a second magnet similarly sus- pended in another apparatus . The deflecting magnet is placed at one or more exactly measured distances from Sect . II . ] 15 TERRESTRIAL MAGNETISM .
Page 16
... deflections thus produced , ( i.e. , the angular differences in the positions of rest of the suspended magnet , 1 ° when influenced solely by the Earth's magnetism , and 2 ° when in equilibrium be- tween the Earth's magnetism and that ...
... deflections thus produced , ( i.e. , the angular differences in the positions of rest of the suspended magnet , 1 ° when influenced solely by the Earth's magnetism , and 2 ° when in equilibrium be- tween the Earth's magnetism and that ...
Page 20
... deflection . For greater accu- racy , several constant weights are employed on each occasion ; and each weight is successively attached to each of the two hooks , a mean being taken of the de- flections on either side of the position of ...
... deflection . For greater accu- racy , several constant weights are employed on each occasion ; and each weight is successively attached to each of the two hooks , a mean being taken of the de- flections on either side of the position of ...
Page 21
... deflection , either with weights or deflectors , cannot be satisfactorily ascertained by a careful observer . It is necessary that a spot should be selected for the observations to be made on board ship , which should have as little ...
... deflection , either with weights or deflectors , cannot be satisfactorily ascertained by a careful observer . It is necessary that a spot should be selected for the observations to be made on board ship , which should have as little ...
Page 34
... deflection , and an apparatus for vibration : these correspond with the two parts of the process by which the absolute horizontal force is determined ; the experiments of deflection consist in observing the angular deflection of a ...
... deflection , and an apparatus for vibration : these correspond with the two parts of the process by which the absolute horizontal force is determined ; the experiments of deflection consist in observing the angular deflection of a ...
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actinometer afford algæ altitude angles animals ascer ascertained atmospheric waves Auriga barometer Cape Horn carefully centre character coast collected colour column corals correct crystals deflection deflector depth desirable determined direction distance earth Engl especially Fcap fissures fossil geology head height high water horizontal igneous rocks important inches inclination inquiry instrument islands kind known land latitude longitude low water lunitidal interval means measure mercury meridian minerals minute mode moon's transit nature navigation needle North noted objects observations obtained occur ocean particular phenomena plants Plates port portion Portrait position Post 8vo preserved quadrupeds racter reefs remarks rivers rocks Second Edition sextant shells ship shore skin sound specific gravity specimens stream substances surface taken temperature thermometer Third Edition three-hourly tide tide-wave tion tribe tube vertical vessels vibration Vols voyage WASHINGTON IRVING wave wind Woodcuts
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Page 18 - MAWE'S (HL) Journal of a Passage from the Pacific to the Atlantic, crossing the Andes in the Northern Provinces of Peru, and descending the great River Maranon.
Page 20 - NEALE'S (EV) Feasts and Fasts: an Essay on the Rise, Progress, and Present State of the Laws relating to Sundays and other Holidays, &c. Fcap.
Page iii - It is the opinion of the Lords Commissioners of the Admiralty, that it would be to the honour and advantage of the Navy, and conduce to the general interests of science, if new facilities and encouragement were given to the collection of information upon scientific subjects by the officers, and more particularly by the medical officers, of Her Majesty's Navy, when upon foreign service...
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Page 281 - It happens fortunately that almost every datum which the scientific meteorologist can require is furnished in its best and most available state by that definite, systematic process known as the " keeping a meteorological register" which consists in noting at stated hours of every day the readings of all the meteorological instruments at command, as well as all such facts or indications of wind and weather as are susceptible of being definitely described and estimated without instrumental aid. Occasional...
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Page 120 - Mistakes and errors have often been produced in tide observations by supposing that the turn of the tide stream is the time of high water. But this is not so. The turn of the stream generally takes place at a different time from high water, except at the head of a bay or creek. The stream of flood commonly runs for some time, often for hours, after the time of high water. In the same way, the stream of ebb runs for some time after low water.
Page 289 - ... no risk of change. The next correction, and the most important of all, is that due to the temperature of the Mercury in the Barometer tube at the time of observation. To obtain this, every Barometer requires to have attached to...
Page 2 - Voyages of Discovery and Research within the Arctic Regions, from 1818 to the present time. Under the Command of the several Naval Officers, employed by Sea and Land, in search of a North-west Passage from the Atlantic to the Pacific : with Two Attempts to reach the North Pole. Abridged and arranged from the Official Narratives, with Occasional Remarks.