. Cyclopedia of architecture, carpentry, and building : a general reference work .... Ficr. 123. 187 116 SHEET METAL WORK In large kettles of this kind, the length of the pattern is guidedby the size of the sheets in stock, and if it was desired that each ringwas to be made in 8 parts then the respective circle in plan fromwhich the stretchout is taken would be divided into 8 parts, andone of these parts transferred to the patterns, to which laps mustbe allowed for seaming and riveting. !D FULL SECTION. Fig. 124. PROBLEMS FOR WORKERS IN HEAVY METAL. AA^liile all of the problems given in this c
. Cyclopedia of architecture, carpentry, and building : a general reference work .... Ficr. 123. 187 116 SHEET METAL WORK In large kettles of this kind, the length of the pattern is guidedby the size of the sheets in stock, and if it was desired that each ringwas to be made in 8 parts then the respective circle in plan fromwhich the stretchout is taken would be divided into 8 parts, andone of these parts transferred to the patterns, to which laps mustbe allowed for seaming and riveting. !D FULL SECTION. Fig. 124. PROBLEMS FOR WORKERS IN HEAVY METAL. AA^liile all of the problems given in this course are applicable todevelopments in heavy metal as well as in that of lighter gauge, thefollowing problems relate to those forms made from boiler plate. When using metal of heavier gauge than number 20, for pipes,elbows, or any other work, it is necessary to have the exact insidediameter. It is customary in all shops working the heavier metal, 188 SHEET METAL WORK 117 to add a certain amount to the stretchout to make up for the lossincurred in bending, in order that the inside diameter of the article(pipe, stack, or boiler shell) may be kept to a uniform and desiredsizt. This amount varies according to different practice of work-men, some of whom allow 7 times the thickness of the metal used,while others add but 3 times the thickness. Theoretically theamount is times the thickness of the metal. For example, suppose a boiler shell or stack is to be made 48inches in diameter out of |-inc
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