The English and American mechanic. Comprising a collection of over 3000 receipts, rules and tables, designed for the use of every mechanic and manufacturer by Van Cleve B. Frank

Author:Van Cleve, B. Frank
Language: eng
Format: epub, pdf
Tags: Engineering, Workshop recipes
Publisher: Philadelphia : B.F. Van Cleve

RECEIPTS FOR MECHANICAL PURPOSES. 18

For a fjold color, grind up gold-leaf with gum water, and apply t

the inside of tin- shells.

Liquid Foil for Silvering Glass Globes, &c. — Lead, part ; tin, 1 part; bismuth, 1 part: melt, and, just before it sets add mercury, 10 parts. Pour this into the globe, and turn it rapidl; round.

To Soften Iron or Steel.— Either of the following method will make iron or steel as soft as lead: — 1. Anoint it all over wit] tallow, temper it in a gentle charcoal fire, and let it cool of itsell 2. Take a little clay, cover your iron with it, temper in a charcoa fire. 3. When the iron or steel is red hot, strew hellebore on H 4. Quench the iron or steel in the juice or water of common beans.

Tempering.— The article, after being completed, is hardened b; being heated gradually to a bright red, and then plunged into col< water: it is then tempered by being warmed gradually and equably either over a fire, or on a piece of heated metal, till of the color cor responding to the purpose for which it is required, as pe- Mi below; when it is again plunged into water.

CORRESPONDING TEMPERATURE.

A very pale straw, - 430 Lancets, t

Straw, ...... 4.10 Razors. $

Darker Straw - - - 470 Penknives. / All kinds of wood tools.

Yellow, ..... 490 Scissors. $ Screw taps.

Brown yellow, - - - 600 ) Hatehets, chipping chisels,

Slightly tinged purple, 520 $ Saws.

Purple, ..... 530 ) All kinds of percussive tools.

Dark blue, .... 600 Soft for saws.

Cast Iron Cement. — Clean borings or turnings of east iron, 16; sal ammoniac, -'; flour of sulphur, 1 part; mix them well togethei in a mortar; and keep them dry. When required for use, take ol the mixture, 1; clean borings, 'JO parts; mix thoroughly, and add a sufficient quantity of water. A little grindstone dust added improves the cement.

Cement for Steam Pipe Joints, Etc., with Faced Flanges. — White lead, mixed, 2; red lead, dry, 1 part; grind. 01 otherwise mix them to a consistence of thin putty; apply interposed layers with one or two thicknesses of canvas, or gauze wire, as the necessity of the case may be.

Crucibles.— The best crucibles are made from a pure fire clay, mixed with finely ground c<innit of old crucibles, and a portion ol black lead or graphite: some pounded coke may be mixed with the plumbago. The clay should be prepared in a similar way as for making pottery ware: the vessels alter being formed, must be slowly dried, and then properly baked in the kiln.

BLACK LEAD CRUCIBLES are made of 2 parts graphite, and 1 of fire-clav, mixed with water into a paste, pressed in moulds, and well dried, but not baked hard in the kiln. This compound forma excellent small or portable furnaces.

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