Popular Science Monthly 



609 



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 



(FAN BLADE 



, FRAME 



CASING 



'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. 



T^ 



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 



