. Train de locomotives : un journal pratique de la force motrice ferroviaire et du matériel roulant . s,ou au moins projet au-delà des points de barbes sur lesquels reposent les plaques principales lors du fonctionnement, comme la fixation des moitiés supérieure et inférieure du ressort est prévue sans utiliser les rouleaux de la courbe inverse contestable, laisser la structure de l'acier intacte. Il est bien knownque une partie importante des ellipticSprings brisés se cassent aux défilés. Les ressorts d'entraînement et les ressorts en double ne sont pas recommandés pour les nouvelles spécifications, car le jeu du ressort d'entraînement est excessif.l'utilisation de 4 in. Ou plus large St

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. Locomotive engineering : a practical journal of railway motive power and rolling stock . s, or at least project beyond the bearingpoints on which the main plates rest whenin operation, as the fastening of theupper and lower halves of the spring isprovided for without using the objection-able reverse curve scrolls, leaving the struc-ture of the steel intact. It is well knownthat a major portion of broken ellipticsprings break at the scrolls. Both thedriving and duplicate springs are notrecommended for new specifications, asthe set of the driving spring is excessive.The use of 4-in. or wider steel in the dupli-cate springs is desirable, the foregoingsprings being exaggerated in dimensionsto better illustrate the strong point claimedunder the most adverse circumstances. ® i i Great Northern Railway Shops. The Great Northern shops at St. Paul, like many another that can count itsyears of usefulness by the score, sometimesfinds itself yearning for a machine toolon which to do certain work cheaper, orto expedite the output. Like all otherwell-regulated shops, it proceeds at once. to the root of the case, and designs some-thing to fill the want. It was decided that oil boxes for carsand tenders could have the faces for thecovers dres.sed to size on a milling machinequicker and better than by the old methodof planing, but the decision came easierthan the machine to do the work. Mr. George Dickson, the general fore-man, had a large horizontal boring machinethat was not in commission at all times, and he concluded that it would do a goodjob of milling if put in proper shape for the work. He first put on a cross-feed forthe table, on mechanical lines and in keep-ing with the general good work on thetool—no makeshift rig for to-day and underthe bench to-morrow—but a permanentfixture.To the boring bar he fitted a milling cut-ter, got up in the form of aclutch, in two pieces that canslide on the bar or arbor, to orfrom each other, to the limit oflength of the lugs, thus incre

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