The London, Edinburgh and Dublin philosophical magazine and journal of science . by comparing the map in the Account &c, the only one in which the locality is marked,with the relief-map by Major Gr. Strahan, and with Prattsdiagram, it appears that More is distant about 80 miles fromthe nearly straight south-western escarpment of the rangefacing the plains, and 400 miles from the escarpment facingthe north-west. If we imagine a series of cap-sectors drawnabout the station, it will appear that the hypothesis of theparallelepiped makes the sectors on the north side too shortnear the cross section
The London, Edinburgh and Dublin philosophical magazine and journal of science . by comparing the map in the Account &c, the only one in which the locality is marked,with the relief-map by Major Gr. Strahan, and with Prattsdiagram, it appears that More is distant about 80 miles fromthe nearly straight south-western escarpment of the rangefacing the plains, and 400 miles from the escarpment facingthe north-west. If we imagine a series of cap-sectors drawnabout the station, it will appear that the hypothesis of theparallelepiped makes the sectors on the north side too shortnear the cross section, and on the south side too long, whileparallel to the range they are necessarily too long. Thiswould make the attraction at the station too small. On theother hand, the actual plateau rises from the plains which are* Loc. tit. p. 20 Be v. 0. Fisher on Variations of Gravity and their about 800 feet high, whereas the parallelepiped has been takenas rising from the sea-level. This would make its attractiontoo great. The difference could be calculated, if worth Further, the slope of the range ought to have been taken intoaccount. Thus a close agreement is not to be , referring to the fifth column of the Table, it appearsthat local attraction at More relative toPunnae ought to produce2*26 swings per diem ; whereas the attraction of our parallele-piped at a station situate as supposed would produce 4*15, ornearly two swings more. The visible masses were estimatedas. being capable of producing 23*57 swings. Hence thehypothesis of the parallelepiped, Irydrostatically supported,accounts for 19*42 out of the 21*31 swings in defect which relation to the Constitution of the Earths Crust. 21 have to be accounted for. So that the theory of hydrostaticequilibrium in this instance may be considered a not unsatis-factory explanation of the phenomena. To understand what has been done, we observe that thecalculated effect of the local attraction of the parallelepip
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
