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��equipped with a shut-off. To this is attached the sprinkling pipe. This pipe should have perforations about 1^2 in- apart, of sufficient size to allow the oil to flow freely. The frame may be easily made by the average handy man, but where the materials are not available the local blacksmith will build it at a small cost. — J. C. Grindell.

��Popular Science Monthly

��proofing can be done by applying a facing to the concrete surface before it begins to harden. A powder can be purchased for this purpose which is mixed with cement in various proportions up to 5 lb. to a bag of cement. This mixture is applied to the con- crete surface and finished smooth with a plastering trowel — giving a fine, moisture proof wall or floor.

��Tipping Truck for a Large Cylindrical Oil Tank

BECAUSE the fau- cet of a kerosene oil barrel leaked more or less continually, the owner devised the tip- ping truck illustrated. The tank was fitted with wheels from a discarded farm spring wagon. Two cross-pieces were run under the tank, the ends being supported on cleats fastened to the spokes on each side of the tank. Two planks were laid and cleats nailed to their

���The oil tank stands in an upright position on the wheels at the rear of the track

��upper surfaces to serve as a track for the wheels. Bumper pieces were placed at the right dis- tances on the ends of the tracks to stop the wheels from rolling far- ther than neces- sary to tip the tank horizon- tally. With this arrangement it is not necessary to

have a faucet at all as a short piece of pipe is sufficient to guide the flowing oil into the retainer of a lamp or other receptacle.

���When it is required to fill a lamp or remove some of the oil the wheels are rolled forward tipping the tank

��Waterproofing for Concrete Walls and Floors

THE general impression is that concrete is water and moisture proof, but such is not the case for if the surface were flat or concave it can be made to absorb almost any amount of water that is put upon it. For certain uses, it is very important to have a waterproof concrete and the water-

��End Mills Made of Broken and Worn Twisted Drills

DRILLS which have been discarded be- cause they have become too short through fre- quent grindings or broken off in use, still have considerable value as end mills when placed in a milling machine for cutting keyways, etc. They may be held in an ordinary three-jawed chuck, or a holder may be made up with a taper shank to fit the spindle of the machine, and a number of split bushings pro- vided, one for each size of drill to be used.

A setscrew will securely clamp and hold the drill in position in the bushings.

They should be ground square, for what is commonly called bottom- ing, on the end and the clear- ance for steel should be about four degrees. On account of the shortness of a broken twist drill, its body will be as rigid for the work as the end mill, and owing to the construction of the shank it will stand considerable rough usage. If fairly deep cuts are to be made, each land should have a little additional clearance stoned on it right up to the edge of the flute. Considerable money can be saved in this way and the results will be almost as good as those obtained by the more ex- pensive end mills. — A. Dane.

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