. The Locomotive. Gen. Agents,R. E. Munro, Chief Inspector, W. M. Francis/Manager, \\. M. Francis, Chief Inspect -r, 833-835 Gravier , Conn.,56 Prospect St. 401 Wood , Ohio, Century , Ohio. 67-69 Mitchell , 111., 169 Jackson Louis, Mo., 319 North Fourth , Col., Room 2, Jacobson Bldf COPYRIGHT, 1909, BY THE HARTFORD STEAM BOILER INSPECTION AND INSURANCE CO. Vol. XXVII. HARTFORD, CONN., OCTOBER, 1909. No. S. On the Number of Courses in a Boiler Shell. Prominent among the many problems that arise in designing a steamtoiler
. The Locomotive. Gen. Agents,R. E. Munro, Chief Inspector, W. M. Francis/Manager, \\. M. Francis, Chief Inspect -r, 833-835 Gravier , Conn.,56 Prospect St. 401 Wood , Ohio, Century , Ohio. 67-69 Mitchell , 111., 169 Jackson Louis, Mo., 319 North Fourth , Col., Room 2, Jacobson Bldf COPYRIGHT, 1909, BY THE HARTFORD STEAM BOILER INSPECTION AND INSURANCE CO. Vol. XXVII. HARTFORD, CONN., OCTOBER, 1909. No. S. On the Number of Courses in a Boiler Shell. Prominent among the many problems that arise in designing a steamtoiler is that of the construction of the shell. We do not here refer to the wayin which the parts should be riveted together, but to the more elementary ques-tion of how many parts there should be. In nearly all of the horizontal tubular boilers that are now met with inpractice, the shell is composed of a certain number of rings, or courses,«ach course consisting of a cylindrical section, composed, usually, of a single. Fig. 1. — Five-course Shell. plate, curved around so that its two ends meet and are riveted together. It wasformerly the custom to have more courses in the shell than are now common,because the plate mills were not equipped to turn out sheets of the large sizethat may be had at the present time. Thus it was usual, in a boiler (say) sixtyinches in diameter and sixteen feet long, to build the shell in five courses, aswill be understood from Fig. 1, which represents the several courses as they Fig. 2. — Three-course Shell. would appear when rolled approximately into shape, but not yet riveted together. As the rolling mills came to put in larger and heavier machinery, so thatplates of much greater size could be turned out, the number of sections inthe shell was reduced, and boilers presently came to be built in three courses,as indicated in Fig. 2. (The three-course boiler, we may say in passing, isthe one that is still favored by this company, for reasons given belo
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