American engineer receives $2800 per annum and the Brit ish engineer $1100 per annum. black resin 2 ozs. Melt together and then add : Prussian blue 1 oz. lampblack oz. While the mixture is cooling add turpentine till a suitable consistency is obtained. It ehould be applied with a soft rag and the leather afterwards polished with a brush., scientific american, 1874-06-06

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American engineer receives $2800 per annum and the Brit ish engineer $1100 per annum. black resin 2 ozs. Melt together and then add : Prussian blue 1 oz. lampblack oz. While the mixture is cooling add turpentine till a suitable consistency is obtained. It ehould be applied with a soft rag and the leather afterwards polished with a brush., scientific american, 1874-06-06

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