Page:Popular Science Monthly Volume 89.djvu/623

This page needs to be proofread.

Popular Science Monthly


��A Blacksmith's Hand-Blower Made of Wood

A WOODEN blower for a forge is something of a novelty. A reader in the southwest sends us the accom- panying drawing.

In the drawing A is the nozzle, B is the fan-casing proper, which might very




��'A large hand-blower made of wood for use in connection with a blacksmith's forge

easily be a cheese-bo.x. The fan-blade and frame are shown at C. D is the opening in one side of the fan-casing for the air supply. It has a batten across it to support the shaft on which the fans are fixed. This shaft has a crank for turning. The apparatus is cheap and practical, as a sheet-iron or wrought-iron pipe connection can be made between the blower and forge.

On account of the absence of multi- plying gearing, the blower should be made several times larger than the geared blowers so common on portable forges. The dimensions and proportions, however, will have to suit the individual requirements. — Lester Smart.

��Four Good Recipes for Acid-Proof

Cements /iN excellent recipe for an acid-proof l\. cement contains the following in- gredients: Crude, finely cut

rubber i part by weight

Linseed oil, boiled 4 parts by weight

Fire-clay 6 parts by weight

Another equally satisfactory mixture requires the following materials:

Rosin I part by weight

Sulphur I part by weight

Fire-clay 2 parts by weight

The following mixture will resist all acid vapors (even nitric acid) :

Litharge 80 lbs.

Red lead 8 lbs.

Flock asbestos 10 lbs.

��These substances should be fed into a mi,\cr, a little at a time, with 6 quarts of boiled linseed oil.

A good cement for dilute hydrochloric acid is the following: White China clay . . . . i part by volume Fine white sand, or powdered quartz

and sand 2 parts by volume

Mix the ingredients thoroughly, working them up with just enough silicate of soda, diluted with an equal \'olume of water, to make a paste. If a little fine casein is added to the silicate of soda, the mixture will be smoother.


��To Convert a Pair of Shoes into

Slippers ^HE shoe illustrated has three sepa- J. rate parts, the upper A, body B, and heel C. To form the complete shoe, the heel is screwed on by the use of four screws. In order to attach the upper, there is used a set of lugs D, spaced all along the edge and these cor- respond to a similar set of lugs E on the body of the shoe.

The upper set of lugs fit exactly into the spaces between the lower ones, and a leather or any suitable lace is run the entire length of the shoe with the two ends brought out in front. The remain- der goes through the eyelets in the upper. Again, when a slipper or low shoe is wanted all that is required is to take off the upper and the heel. — F. P. Mann.

���The heels may be unscrewed and the tops taken off or put on whenever desired

�� �