. Canadian Shipping and Marine Engineering January-December 1916. the exigencies of thework. Project these located points tothe mitre line, as explained in Fig. 1. The stretchout LGL, Fig. 4, equalsIV2 times , which equals inches,or slightly less than 4% inches. Bisectthis line LGL at 7° and erect the perpen-dicular 7°71, thus locating the centre line MARINE ENGINEERING OF CANADA of the templet, and also defining- theseam lines ll1 and 1°1K Divide IT and7*7° each into the same number of equalspaces, as in Fig. 3. Erect perpendicu-lars parallel to the centre line 7Tthrough the points t
. Canadian Shipping and Marine Engineering January-December 1916. the exigencies of thework. Project these located points tothe mitre line, as explained in Fig. 1. The stretchout LGL, Fig. 4, equalsIV2 times , which equals inches,or slightly less than 4% inches. Bisectthis line LGL at 7° and erect the perpen-dicular 7°71, thus locating the centre line MARINE ENGINEERING OF CANADA of the templet, and also defining- theseam lines ll1 and 1°1K Divide IT and7*7° each into the same number of equalspaces, as in Fig. 3. Erect perpendicu-lars parallel to the centre line 7Tthrough the points thus located, alsonumbering each perpendicular in rela-tion to the construction lines, as ll1,2°21, etc., in Fig. 3. Transfer all thedistances 7T, 6°61, 5V, etc., in Fig. 3,over to their corresponding ordinates inFig. 4. An even drawn curve throughthese points locates the rivet line orseaming line. Laps to be added accord-ingly. Elbow With Gore Fig. 5 illustrates a two-course 90-de-gree elbow, with the section BKC cutaway to clear an obstruction, the gore. which equals X W2 = slightly lessthan 4% inches. Measure off GAG, Fig. 6, equal to <i%inches. Divide this into 12 equal spaces,erect perpendiculars and number in re-lation to their corresponding lines inFig. 5. Set the dividers to the variousdistances, 7T, 626\ &&, 4**1, 323l, &21,l2!1, in Fig. 5, and transfer these overto their allocated lines on Fig. 6. Anevenly-drawn curve through these pointslocates the mitre or rivet line. Fig. 6illustrates the templet, to which must beadded laps according to requirements,whether for seaming or riveting. The gore BCH will now be dealt is here necessary to have a cross sec-tional view through the plane H73, , to obtain the true length or stretchoutof the sore, which is foreshortenedin the elevation view shown inFig. 5. The cross sectional view is shownin Fig. 8. The construction of such is asfollows: From the points 71, 61, 51,41 draw parallel lines to BC, andpro
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