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In this paper details are given of a welded steel construction as applied on a diesel engine of 50 B.H.P. per cylinder at 430 r.p.m, the number of cylinders of which may be varied from one to eight. Fundamentally the construction of the frame of the engine, which is of the crosshead-type, consists of vertical frame plates running from top to bottom, between which two welded steel pre-fabricated boxes are welded, one for the cylinder liner and one for the crosshead liner. In the bottom of the frame plates pre-fabricated main bearings of cast steel and welded, in which bronze bushings, lined with white metal, are mounted afterwards. The welding is done in a special turnable jig, which holds both boxes and frame plates on their essential pre-machined points, which results in a deflection afterwards of not more than 0,10 mm (0,004''). The complete frame is not annealed. By hand scraping the holes are easily made true to caliber size. The engine frame is of the one-piece type; therefore the crankshaft is mounted through the front side. Attention is given to the guidance of the upward forces in the cylinder from the cylinder head through the frame plates to the crankshaft-bearings. In this respect a patented device for the fastening of the four studs of the cylinder head is shown.