. Canadian Shipping and Marine Engineering January-December 1916. evelop-ment. To save confusion of lines, trans-fer carefully the outline of the course III—as represented by the letters K, L. , P, T—Fig. 2, over to Fig. 4. With centre T and radius TKorl Pdescribe the half section view K 5 this semicircle into a suitablenumber of equalparts; the greater thenumber, the more accurate the this case it is divided into 8 equalparts. Project all these points to, andat right angles with K, T, P. With U as centre and radius U L orU Q, describe the half section 51 Q. Divid
. Canadian Shipping and Marine Engineering January-December 1916. evelop-ment. To save confusion of lines, trans-fer carefully the outline of the course III—as represented by the letters K, L. , P, T—Fig. 2, over to Fig. 4. With centre T and radius TKorl Pdescribe the half section view K 5 this semicircle into a suitablenumber of equalparts; the greater thenumber, the more accurate the this case it is divided into 8 equalparts. Project all these points to, andat right angles with K, T, P. With U as centre and radius U L orU Q, describe the half section 51 Q. Divide this semicircle into equalparts, the same number as that used forthe semicircle K 5 P. Erect perpendiculars from L U Q tothese division points. Number the divi-sion points on both circles in consecutive-order and in relation to one another. Alsonumber the projection points on the line?L U Q and K T P in respect to theirrelative projection lines. Connect thepoints 22 to 23. 32 to 33. 4 2 to 4s, bystraight lines. If both of the half section views were. FIG. 3. equal, these straight lines, 22 23, 32 3\etc., would be shown in the drawing bytheir true lengths. However, the sec- MARINE ENGINEERING OF CANADA tions are not equal, therefore the linesin question will be foreshortened. Their true lengths are found by tri-nngulation, as follows: Draw the hori-zontal line 23 8s, Fig. 5. Erect perpen-diculars at any point, as at 0. Measureoff the perpendicular 0 22, Fig. 5, equalin length to 2s 22. Fig-. 4. Take the dif-ference of the leneths of the projectorlines 2- 21 and 23 2, Fie. 4. Place this dif- / 4 \1 \ / \ / \ i\V V \\ w \/ ..\\p \2 i \ 8/ 43 42 over to X 42, Fig. 6. Obtain the dif-ference between the projectors 3 33 and42 41, and place at X 33, Fig. 6. The truelength is shown by the line 42 43. In asimilar manner define the true lengths ofthe remaining dash lines. Having obtained all the true lengths,the development of the plate will be nextproceeded with. Plate Develo
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