Canadian foundryman (1917) . plants have specified colors fordifferent parts of their patterns. Theground work is natural wood finish, coreprints are black, and surfaces that areto be machined are red. While this isonly a typical color scheme, it serves foran example, and the moulder knows at aglance just what the casting will be andhow it will be worked up in the whatever the color scheme, shellacis the basis of the coating, and the vari-ous colors are obtained by mixingpowders in the clear shellac. Manyplants paint their patterns black, and toget that, mix lampblack i
Canadian foundryman (1917) . plants have specified colors fordifferent parts of their patterns. Theground work is natural wood finish, coreprints are black, and surfaces that areto be machined are red. While this isonly a typical color scheme, it serves foran example, and the moulder knows at aglance just what the casting will be andhow it will be worked up in the whatever the color scheme, shellacis the basis of the coating, and the vari-ous colors are obtained by mixingpowders in the clear shellac. Manyplants paint their patterns black, and toget that, mix lampblack in the shellacand thin with denatured alcohol. The present high cost of shellac hasbrought into prominence one or two verygood shellac substitutes, which fill thepurpose well, but take a longer time toharden than shellac. It should be bornein mind that the purpose of the coatingis primarily to protect the wood fromthe destructive effects of the dampmoulding sand. Holes and imperfectionsin the wood surface are commonly filled. FIG. 3. FIG. 4. with beeswax; small fillets and cornersare formed from it. Paraffine wax ismuch cheaper and just as g:ood, but pat-ternmakers have trouble in making itstick to the wood. If the pattern is givenone coating of shellac first and then theparaffine applied hot, it will stick as wellas beeswax. 62 CANADIAN FOUNDRYMAN FOUNDRYMEN AND PRICECUTTING By Cupola. IF there is one question more vital tothe foundryman than another it isthe question of price-cutting. Othertrades are beginning to see that theevil of price-cutting is ruinous to thefoundryman. No less than any otherline, and particularly to the jobbingfoundryman. The manager of a largefoundry, in speaking upon this sub-ject, stated: It just amounted to had to buy over several specialtiesand acquire the sole manufacture ofthem, or close down. This expendituremeant thousands of dollars of new capi-tal, scrapping a whole lot of accumu-late:! equipment, of which there is noend in a jobbing s
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