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1.
《测量评论》2013,45(29):413-417
AbstractIn the E.S.R. No. 17 of July 1935, page 138, there appeared an article by Prof. F. A. Redmond on “The use of Even Angles in Stadia Surveying”. Since I have given this method a six-months' test in the field, using Prof. Redmond's “Tacheometric Tables” for the reduction of the measurements, the conclusions reached may be of some interest. 相似文献
2.
《测量评论》2013,45(12):345-346
AbstractIn the course of his stimulating and suggestive paper in your recent issue, No. ro, pp. 226–38, Mr. A. J. Potter writes on p. 233 “but there is no simple construction by which X can then be found”, and again on p. 237 “a direct construction, if there be such”. This cheerful challenge invites the construction of a circle centred on a given line, passing through a given point thereon, and touching a given circle, and I have found the lure of Mr. Potter's gauntlet as irresistible as its recovery has proved delicate. In order to shoulder responsibility and by no means to claim highly improbable originality, let me confess that the problem is new to me and the two constructions I offer are my own; I venture to hope that Mr. Potter may consider one or other of them not unworthy of his epithet “simple”, though I freely admit the aptitude of his empiric procedure to its purpose. The proofs are not long, but for fear of overshooting my welcome I offer them to anyone for the asking; and for the same reason my diagrams are small and therefore mere. 相似文献
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4.
《测量评论》2013,45(54):306-311
AbstractTo one brought up in Switzerland the call of mountains had always been irresistible, so in 1908 I counted myself lucky in being posted for my first field season in the Survey of India to the party which was that year to plane-table the Nilgiri Hills of the Madras Presidency. The ultimate goal was the Himalaya, not to be achieved for many years, and I well remember my feelings of acute jealousy when Kenneth Mason succeeded in joining the Kashmir party a year or two later. Still, there were compensations even in South India. The party moved southwards into Travancore the following year, and it fell to my lot to tackle a mysterious blank marked on the quarter-inch “Atlas” sheets of India “High waving mountains covered with impenetrable forests and overrun by wild beasts”. This was the catchment area of the Periyar Dam constructed some seventeen years previously by Col. Pennycuick, R.E. (if I remember rightly), for the purpose of diverting some of the monsoon rainfall of the Western Ghats to the dry Tinnevelly side of the watershed. The dam had formed a narrow many-armed lake running 21 miles into the “waving” mountains and ending at the fringe of the “impenetrable forest”. To that extent the communications problem was solved: by the use of dugouts. These the younger generation of the small jungle tribe living on the lake border had learnt to make and to paddle. I spent two interesting if lonely seasons there, first triangulating alone and then plane-tabling with a “camp” of eight Indian surveyors. The lake area was open country, if you can call 10-foot elephant grass open. Against Forest Department orders I more than once set a match to the grass in the evening and found several square miles clear for work by next morning. This simplified getting about, but the charred grass stalks made one black from head to foot. Apart from my own men I met no one whose language I could speak during those two seasons except some tea-planters from Pirmed on one occasion, my “O.C. Party”, Sackville Hamilton, who came to inspect, and Stoehr of the Sapper batch above me who came to shoot an elephant. 相似文献
5.
《测量评论》2013,45(77):302-306
AbstractAlthough during World War II field work on geodetic subjects other than those directly connected with the war effort remained practically in abeyance, the war provided unique opportunities for the study and execution of several interesting problems such as the linking of Indian triangulation with Iraq and Iran on the one hand and Siam and Malaya on the other. A detailed account of the Geodetic work of the Survey of India during the period 1939-47 is given in the Survey of India “Technical Report 1947—Part III, Geodetic Work”. 相似文献
6.
Abstract Introductory.—From time to time the question of the relation between the metre and the foot is raised, most frequently perhaps from Africa. Had there been no more than a single metre to consider the question would no doubt arise but seldom: the most recent authoritative comparsion would be generally accepted. But actually it is the existence of two metres—the “ legal” and the “international”—which complicates the question, so much indeed that there is no metrological factor which has influenced survey, British and foreign, more than the relation between these two metres. The question was discussed in this Review (I, 6, 277, 1932), but memories grow shorter, attention is more diffused, and besides there is required a more explicit statement of the situation as it affects British surveyors, especially in Africa, whence the question has been raised anew. To illuminate it, unfortunately the need recurs to repeat some well-known facts. 相似文献
7.
《测量评论》2013,45(44):322-324
AbstractIn the last three years about 250 miles of “precise” traverse have been surveyed in this country to provide control for detail surveys. A brief account of the results may be of general interest. The traverses are situated where trig. points are far apart, and the cost of subsidiary triangulation would have been excessive on account of the flat nature of the country. 相似文献
8.
《测量评论》2013,45(12):329-330
AbstractMajor Hotine (E.S.R., No. II, pp. 264–8) still finds the location of a reference spheroid to offer insuperable difficulties. I confess that my difficulty is to see his! In my previous article (E.S.R., No. 8) at the foot of page 76, I used the word “coincidence” in error for “parallelism”. This harmonizes the article and I am glad that Major Hotine has directed attention to the error. 相似文献
9.
《测量评论》2013,45(69):282-295
AbstractSurveying in, the sense in which I propose to consider it this evening, is the technical term given to the science of admeasuring and delineating the physical features of the earth and of works executed or proposed upon its surface. I am in some difficulty over a precise definition which will satisfy everyone since, although “surveying” is generally understood in the English language to have the above meaning, there is a growing tendency to use the somewhat restricted term” land survey"; restricted since it implies omission of hydrographic, hydrological and other forms of measurement of natural features and of setting out. This is, of course, not so. 相似文献
10.
《测量评论》2013,45(13):386-391
Abstract The International Population Union.—In 1927, as President of the Geographical Association, it was my duty to deliver an address to the Association. I chose as my subject “Population and Migration” with special reference to the English-speaking peoples. One result of the publication of this in Geography, the journal of the Association, was that I was invited to attend the World Population Conference, which was held at Geneva in August-September 1927. The Conference was a very interesting affair. It was organized, and largely paid for, by Mrs. Margaret Sanger. About twenty-four countries were represented. The late Sir Bernard Mallet presided, and in one of his speeches, winding up the Conference, he truly said that we might “congratulate ourselves on having shown the world that population questions, which bristle with controversy, political, moral, and religious, can be discussed by sensible people without animosity or unseemly wrangling”. 相似文献
11.
《测量评论》2013,45(61):267-271
AbstractSome publications that have dealt with the question of convergence of meridians seem, to the present writer, to be clouded with misconception, and these notes are intended to clarify some points of apparent obscurity. For instance, A. E. Young, in “Some Investigations in the Theory of Map Projections”, I920, devoted a short chapter to the subject, and appeared surprised to find that the convergence on the Transverse Mercator projection differs from the spheroidal convergence; the explanation which he advanced can be shown to be faulty. Captain G. T. McCaw, in E.S.R., v, 35, 285, derived an expression for the Transverse Mercator convergence which is equal to the spheroidal convergence, and described this as “a result which might be expected in an orthomorphic system”. Perhaps McCaw did not intend his remark to be so interpreted, but it seems to imply that the convergence on any orthomorphic projection should be equal to the spheroidal convergence, and it is easily demonstrated that this is not so. Also, in the second edition of “Survey Computations” there is given a formula for the convergence on the Cassini projection which is identical, as far as it goes, with that given for the Transverse Mercator, while the Cassini convergence as given by Young is actually the spheroidal convergence. Obviously, there is some confusion somewhere, and it is small wonder that Young prefaced his remarks with the admission that the subject had always presented some difficulty to him. 相似文献
12.
《测量评论》2013,45(11):264-268
AbstractI may say at once that this article has nothing to do with either the Gaiety chorus or the “Old Firm”: it is merely a statement of what seem to me the fancies in Dr. de Graaff Hunter's paper “Figures of Reference for the Earth”, E.S.R., No. 8,pp. 73–8. Many readers of the Review will share my gratitude to Dr. Hunter for his lucid presentation of the theory underlying the usual geodetic processes. I disagree with only one of his points, and its implications, but unfortunately that point is fundamental. 相似文献
13.
《测量评论》2013,45(53):276-278
AbstractI Have read with interest Mr. L. P. Lee's remarkably well-informed article in the January number (vii, 51, 190) on “The Nomenclature and Classification of Map Projections”. I agree with much of what Mr. Lee says, but I cannot think that he has always been happy in his choice of names. 相似文献
14.
《测量评论》2013,45(24):66-67
AbstractWhen Clarke had written finis to his account of the Principal Triangulation he and O'Farrell (his famous chief computer) framed those simple methods of computation which were to be characteristic of the work of the “tertiary computers”. The tertiary triangulation, resting upon an adjusted primary and a rather poor-class secondary, covered the country at distances of a little over a mile between points. Points were chosen not so much for visibility as for convenience of chaining. 相似文献
15.
《测量评论》2013,45(21):422-427
AbstractThe survey of “mailos” or native estates in the Kingdom of Buganda has taken a prominent place in the annual programme of the Survey Department of Uganda for over 30 years past. The survey, which has covered some 17,000 square miles and is now practically complete, has some unusual features, and although it has no claims to refinement or to great precision, a short account of its history and workings may be of general interest. The system of land settlement introduced by Sir Harry Johnston has already been described in the Empire Survey Review (“The Surveyor and the Politician”, by H. B. Thomas, vol. ii, p. 28). 相似文献
16.
《测量评论》2013,45(40):93-96
AbstractIn Close's “Text-book of Topographical Surveying” there still appears, as Plate XVII, a specimen of small-scale plane-table work in Somaliland. It dates back to 1903. In the first edition of the Text-book, which to the joy of all soldier surveyors replaced the “Manual of Military Topography”, the letterpress referring to Military Surveys dealt entirely with rapid small-scale mapping and with hasty triangulations. 相似文献
17.
《测量评论》2013,45(29):425-430
AbstractThe town plans in question are those ranging from the “five-foot” (1/1056) to the modified “ten-foot” (1/500) scales, made by the Ordnance Survey between 1841 and 1894, and then, in principle at any rate, abandoned. This is, I fear, wholly a British matter and profuse apologies are offered to oversea readers. Yet history, repeating itself as usual, may presently add the wider interest to the tale. 相似文献
18.
《测量评论》2013,45(83):219-223
AbstractMr. Rainsford's article on “Least Square Adjustments of Triangulation: Directions versus Angles” in the Empire Survey Review No. 78, Vol. x, October 1950, leads to many speculations and interesting results. I try to show here, how, by assuming artifices to simplify the results, weights may be assigned to angles derived from directions so that the results of adjustment by angles, with these weights, will be the same as the adjustment by directions, all of equal weight. 相似文献
19.
《测量评论》2013,45(8):73-78
Abstract1. The object of this note is to clear up what I believe to be some misconceptions regarding the use of a reference system by a surveyor of the earth's surface. In his article “An Aspect of Attraction”, E.S.R., No. 7, pp. 24–8, Major M. Hotine expressed doubts as to the validity of the process usually followed. I may say at once that I consider these doubts are unfounded. 相似文献
20.
《测量评论》2013,45(36):334-336
AbstractThe following paragraphs may serve to show that there is more in the word antipodes than meets the eye. And it will be reasonable in an investigation of this sort to begin with some dictionary definitions. For this purpose let us take the definitions given in the “Oxford Dictionary”. 相似文献