The treatment of stone.
Some Indians are particularly clever in the art of stone dividing. They build a double wall of clay the whole length of the stone, leaving about six inches of bare rock between them. They then lay more clay on the outsides of the walls, nearly the width of the stone. Then between the walls of clay they make a long line of fire with dry cow dung and chips of hard, dry wood. An incredibly short space of time elapses before the division of the stone is completed, when the fire is carefully extinguished with earth or sand, and the stone allowed to cool. Rocks, so placed as to prevent recourse being had to either of the expedients described, may be split out by the action of a small charge of powder, fired, as before directed, in a hole made by the jumping bar. To drill a hole with this no hammer man is required, but the weight of the protuberance on the instrument, when aided by a jumping and rotatory motion, is sufficient to cut away the rock. Water swab, shell scraper, &c., are used with these implements, just as they are with the miner’s borer, which can be used in confined spaces and under outlying works, where the jumper would be useless. A crowbar or two will be found very useful for lifting out broken pieces of stone, &c. There is also an instrument much used in America called a “canthook,” which is [here] represented. It is extremely valuable for moving both stones of large size and logs of unwieldy dimensions. The handle, or lever, is made of tough, well-seasoned timber, and is usually from 6ft. to 7ft. long. The claw is of sound, tough, wrought iron, and proportioned in weight and spread to the bodies it is applied to. Two or three sizes of claws fit one handle, just as a dentist’s key is adapted to the size of the tooth it is to grasp. An oblong square hole is cut through the lever for the claw’s end to pass through, and a stout iron pin, with a hole in the end for a split stop to go into, keeps the claw at its proper point of adjustment. The boulder claw is another most useful implement. It is used for turning over and rolling out large boulders of rock, lifting out logs, &c. These claws, and the chains and rings to which they are attached, should be made of the best Swedish iron; the claw point should be of gad steel, welded in. The form of the hook or claw is very important, as, if not turned to the exact bend, it will not grip or hold. The above illustrations will serve to show both the form of the claw and its mode of action when in use.
THE BOULDER CLAW.
Miners’ pump, to make.
When water settles in a comparatively shallow pit, too large to be conveniently emptied by the aid of buckets, a very simple form of pump will be found useful. Nail four long planks together in the form of a narrow square box or tube, say 1ft. square; now procure a stout pole a little longer than the box, nail a flat board to one end of it just as a table is attached to its stand, cut away the edges until it fits the box loosely, then nail a bordering of old boot leather or hide round the edges until it fits tight enough to suck; cut a large square hole in it, and fasten over this with tacks a piece of tapping leather or raw hide backed with wood for a valve; bore a hole in the upper end of the pole to put a cross handle through; bore an auger hole through the lower end of your box about 1ft. from the opening, and through this drive a stout stick to keep the sucker from coming too far down; your pump is now complete. Place it in a slightly slanting direction in the pond, and secure it with a crooked stick driven in by its side; push the sucker to the bottom, pour a bucket of water or so in to make it draw, and you will, by working the piston steadily up and down, soon have the water pouring in a flood over the upper edge of the box, where it can be caught in a hollow log or a pit lined with clay. One of these box pumps is shown in the full page illustration “[Searching for Gold.]”
Charcoal burning.