Industrial recipes : a collection of useful, reliable, practical recipes, rules, processes, methods, wrinkles and practical hints : forming a reliable workshop companion for all en by Phin John 1830-1913 & Phin John 1830-1913 & Phin John 1830-1913

Author:Phin, John, 1830-1913 & Phin, John, 1830-1913 & Phin, John, 1830-1913
Language: eng
Format: epub
Tags: Workshop recipes, Industrial arts
Publisher: New York : Industrial Book Co.
Published: 1913-03-25T05:00:00+00:00

basket vork is said to dry rapidly, to possess sufficient elasticity, and to be applicable with or witbout admixture of color : Heat 375 grains of good linseed oil on a sand bath until it becomes stringy, and a drop j^laced on a cold, inclined surface does not run ; then add graduaDy 7,500 grains of copal oil varnish, or any other copal varnish. As considerable efferv^escence takes place, a large vessel is necessary. The desired consistency is given to it, when cold, by addition of oil of turj^entine.

Black Varnish for Optical Work. —The external surfaces of brass and iron are generally blacked or bronzed with compositions given under the head of lacquers. The insides of the tubes of telescopes and microscojjes should be coated with a dead black varnish so as to absorb the light and prevent any glare. The varnish that is generally used for this l^urpose consists of lampblack, made liquid by means of a very thin solution of shellac in alcohol, biit such varnish, even when laid on warm metal, is very apt to scale off and thus produce two serious evils—the exjjosure of the bright metallic surface and the dei^osit of specks on the lenses. It will therefore be found that lamj^black, carefully gi'ound in turpentine, to which about a fifth of its volume of gold size or boiled linseed oil has been added, will adhere much more firmly. The metal should l)e warm when the varnish is applied. Care must be taken not to use too much gold size, otherwise the effect will be a bright black instead of a dead black.

Black Varnish for Cast Iron. —1. For those objects to which it is aj^ijlicable one of the best black varnishes is obtained by applying boiled linseed oil to the iron, the latter being heated to a temj^erature that will just char or blacken the oil. The oil seems to enter into the pores of the iron, and after such an application the metal resists rust and corrosive agents very jjerfectly.

2. Fuse 40 oz. of asphaltum and add i a gallon of boiled linseed oil, 6 oz. red lead, 6 oz. litharge, and 4 oz. suli^hate of zinc, dried and powdered. Boil for two hours and mix in 8 oz. fused dark amber gum and a pint of hot linseed oil, and boil again for two hours more. Wlien the mass has thickened withdraw the heat and thin down with a gallon of turpentine.

(jrree?i Varnish. —There is a most beautiful transparent

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