282 



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. 



