. Canadian Shipping and Marine Engineering January-December 1918. 9 is shorter than the lineA J F K C; this, then, will have to beshown in Fig. 3. From the located pointE, draw a straight line to F, locating thepoint F where this line intersects therivet line. Fig. 3. Measure carefullyalong the curve from this point F tothe point 9. This distance is then meas-ured from 5° to 9 in Fig. 3. The dis- MARINE EXGINEERINC; OF CANADA * 45 tance F to 1, Fig. 2, is next transferredto Fig. 3 as from 5° to 1\ Suitable curvesare drawn through the points 9 C 9 and1 A 1 respectively. This completes thetemple
. Canadian Shipping and Marine Engineering January-December 1918. 9 is shorter than the lineA J F K C; this, then, will have to beshown in Fig. 3. From the located pointE, draw a straight line to F, locating thepoint F where this line intersects therivet line. Fig. 3. Measure carefullyalong the curve from this point F tothe point 9. This distance is then meas-ured from 5° to 9 in Fig. 3. The dis- MARINE EXGINEERINC; OF CANADA * 45 tance F to 1, Fig. 2, is next transferredto Fig. 3 as from 5° to 1\ Suitable curvesare drawn through the points 9 C 9 and1 A 1 respectively. This completes thetemplet for the back sheet; laps, ofcourse, to be added as required. If thereader is in doubt about the curves 9 C 9and 1 A 1, perhaps it would be just aswell to prolong the rivet line from 9 to9° and from 1 to 1°, thus leaving theends square. It will require in any caseto be dressed after being blocked orhollowed out. The throat sheet is developed in amanner similar to the back sheet. Thedistances in Fig. 2, B L and L M, M Nand N D measured along the curve, are. / ^ / FIG. 3. DEVELOPMENT OF BACK SHEET. transferred over to Fig. 4 and located onthe straight line by the points B L M N lines at right angles to B D aredrawn through these points. In Fig. 4,B 2° is made equal to B 2°, Fig. 2, whichis also equal to A 1°, Figs. 2 and , L 4°, Fig. 4, is made equal toL 4°, Fig. 2. Similarly the distanceM 6°, N 8°, D 10°, Fig. 2, are trans-ferred over to their respective positionsin Fig. 4. It will be observed that thedistances B 2°, L 4°, M 6°, Fig. 4,are equal to the distances respectivelyA 1°, J 3°, F 5°, etc., in Fig. 3. Through these located points draw an even curvewith the flexibfe wooden batten, as wasdone in Fig. 3. It will be noticed that the rivet line2 4 6 8 10, Fig. 2, is longer than theoutline B L M N D. This extra lengthmust be added on to the rivet line inFig. 4. From the point G, through thecentre of the quadrant M N D, draw theline G H
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