A Manual of Scientific Enquiry: Prepared for the Use of Officers in Her Majesty's Navy, and Travellers in General

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John Frederick William Herschel, Robert Main
J. Murray, 1871 - 392 pagine
 

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Pagina 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...
Pagina 71 - 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.
Pagina 115 - Of the Times of Observation and Registry. Meteorological observations should be made and registered daily, at stated and regular hours. In fixing on these, some sacrifice of system must of necessity be made to the convenience and habits of the observer. The best hours in a scientific...
Pagina 254 - Beading maketh a full man: conference a ready man; and writing an exact man. And, therefore, if a man write little, he had need have a great memory; if he confer little he had need have a present wit; and if he read little, he had need have much cunning to seem to know that he doth not.
Pagina 114 - ... 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 observations apply to occasional and remarkable phenomena, and are by no means to be neglected ; but it is to the regular meteorological register, steadily and perseveringly kept throughout the whole of every voyage, that...
Pagina 143 - The usual course of periodical winds, or such as remarkably prevail during certain seasons, with the law of their diurnal progress, both as to direction and intensity — at what hours, and by what degrees, they commence, attain their maximum, and subside, and through what points of the compass they run in so doing.
Pagina 304 - ... rapidly: the first due to the originating normal wave; the second to the transversal waves vibrating at right angles to it. If we can find the point of the surface vertically over the origin, and the direction of emergence of the shock at a distant point, or the angles of emergence at two distant points, neither of which is vertically over the origin—ie, in one' coseismal line—we can find the depth of the origin from the surface by methods p6inted out in Mr. Mallet's Fourth Report on Facts...
Pagina iii - Lordships are desirions that for this purpose a manual be compiled, giving general instructions for observation, and for record in various branches of science. Their Lordships do not consider it necessary that this manual should be one of very deep and abstruse research. Its directions should not require the use of nice apparatus and instruments ; they should be generally plain, so that men merely of good intelligence and fair acquirement may be able to act upon them ; yet, in pointing out objects,...
Pagina 301 - The principle referred to is that an earthquake is " the transit of a wave of elastic compression in any direction, from vertically upwards to horizontally, in any azimuth, through the...
Pagina 337 - ... too long in this medium, and then one by one removed to the third dish, and a piece of white paper, of the size suited to that of each specimen, is to be introduced underneath it. The paper is to be carefully brought to the surface of the water, the specimen remaining displayed upon it, with the help of a pair of forceps or a porcupine's quill, or any finepointed instrument ; and it is then to be gently drawn out of the water, keeping the specimen displayed. These wet papers, with their specimens,...

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