L'atelier de l'homme pratique et de laboratoire . iler à bon niveau et passe à l'obtenir jusqu'à la vapeur.-47 MÉTHODE D'ASSIGNATION D'UNE CHAUDIÈRE La méthode suivante d'un patch de boulonnage sur un perhapsshows chaudière un peu d'originalité. Il a été nécessaire d'assigner la partie inférieure de la chambre de combustion de l'OOF une très ancienne chaudière, mal ponctuées sur les vis de côté. Le rivetage était impossible faute d'espace. Thepatch avait cinq pieds par deux, monté sur le côté du feu, et le greatestdifficulty à surmonter a été de rendre les vis étanche, owingto l'impossibilité de les conduire ou d'obtenir un contact sousla tête contre les mauvaises plaques. Les joints

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Handy man's workshop and laboratory . iler tothe proper level and proceeded to get up steam.—47 METHOD OF PATCHING A BOILER The following method of bolting a patch on a boiler perhapsshows some originality. It was required to patch the bottom ofa combustion chamber of a very old boiler, badly pitted on thewater side. Riveting was impossible for want of space. Thepatch was five feet by two, fitted on the fire side, and the greatestdifficulty to overcome was to make the bolts watertight, owingto the impossibility of driving them or getting a contact underthe heads against the bad plates. Gaskets did not appeal to therepairer, and a metallic contact was aimed at. This was accom-plished by making each bolt act as an ordinary miter-seated valve.They were turned a hand-workable fit (all but the last % inch, HANDY MANS WORKSHOP AND LABORATORY 17 /5 which was tight) to reamed holes of steel, and case-hardened, fitted in from the water side, and hammered up with a spanner.The seat was sunk into the boiler plates. There were alto-. Fig. 157—Bolting a patch on a boiler gether 128 bolts in the patch. The job when finished passed agovernment inspectors examination, and steamed from Honoluluto San Francisco without mishap.—46 STRAIGHTENING BUCKLED CASTINGS It is a rare occurrence for long castings to leave the moldsperfectly true and level. When cooling off in the sand, theyoften buckle out of shape. It is necessary, as in the case ofdrainage cover castings, for instance, to have them level, so thatwhen the horses and vehicles pass over them, they will not tiltor shake. These castings areusually straightened In theblacksmiths shop in the fol-lowing manner: Take, for example, a grat-ing like that shown here, which is used by street rail-ways to allow the surfacewater to drain into thesewers, and which has to fit very snugly the recess of the trapbox in which it lies. The casting is placed in the fire, andheated to a dark cherry red, when it is taken out and placedupon the anvi

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