. The London, Edinburgh and Dublin philosophical magazine and journal of science . 0-74 162 146 90 24 II. ... 1-49 1-18 572 477 468 •79 •84 •98 835 4-0 in. ... 2-23 1-81 2,350 1,880 1,790 •81 •80 •96 80 4-8 IV. ... 3-35 230 5,500 4,070 4,080 •69 ■74 102 74 6-3 V. ... 447 2-84 8,000 6,160 6,200 •64 •77 1-00 77 5 4 VI. ... 6-70 384 10,700 8,680 8,800 57 •81 1-01 SI 46 VII. ... 11(> 6-04 13,500 11,900 11,740 •52 •88 •99 88 29 VIII. ... 200 11-50 14,300 12,900 13,600 •58 •90 1-04 90 23 IX. ... 350 22-10 15,200 14,100 14,600 •63 •92 104 92 1-9 permit accurate reading of the quantities ; th
. The London, Edinburgh and Dublin philosophical magazine and journal of science . 0-74 162 146 90 24 II. ... 1-49 1-18 572 477 468 •79 •84 •98 835 4-0 in. ... 2-23 1-81 2,350 1,880 1,790 •81 •80 •96 80 4-8 IV. ... 3-35 230 5,500 4,070 4,080 •69 ■74 102 74 6-3 V. ... 447 2-84 8,000 6,160 6,200 •64 •77 1-00 77 5 4 VI. ... 6-70 384 10,700 8,680 8,800 57 •81 1-01 SI 46 VII. ... 11(> 6-04 13,500 11,900 11,740 •52 •88 •99 88 29 VIII. ... 200 11-50 14,300 12,900 13,600 •58 •90 1-04 90 23 IX. ... 350 22-10 15,200 14,100 14,600 •63 •92 104 92 1-9 permit accurate reading of the quantities ; the curve con-necting B and /iwas deduced and likewise plotted. Reducedcopies of these curves are shown at R (figs. 5 and 6). Referencesafter must be taken to apply to the large-scale curves as before. Magnetic Induction in a Long Iron Bar. 267 From curves Q we can easily deduce the mean inductionby taking the area and base of the curves ; this is given inTable II. under the heading B,„. The equivalent length of Ker. 5. 1(3,000 12,000 10,000. Values of H. the bar will be the same proportion of its actual length thatBOT is of Bc; this is also shown in the table. Half the differ-ence between the true and the equivalent lengths will give thedistance of the resultant pole from the end; this is tabulatedunder the heading D. From Table I. and the curve P the actual inductions canbe derived for the various points of the bar at any definitevalue of Ha ; if we can assume the annealing to have beengood enough to permit us to take the bar as being the sameunder the two conditions (which is borne out by the closeapproximation of the curves towards the maximum induction),it is possible to deduce the distribution of H in tbe bar bycross reading from curve R the value of the H for each valueof B at each point. Curves showing the distribution of H aregiven in set S (fig. 7). From these the value of the mean H wasfound as above described for B, and is tabulat
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
