768 



Popular Science Monthly 



It is necessary to select the proper style 

 of wheel for the fall of water. In this case, 

 due to the small amount of water and head, 

 it was advisable to use an overshot wheel. 

 Where a stream has a greater head or 

 volume of water a turbine wheel would be 

 much better. The water is run into a pipe 

 which terminates in a nozzle, and as the 

 water spurts out at a high velocity the 

 force is brought against cups on the wheel, 

 making it turn and generating the power. 



In the installation shown, a flume was 

 made of 2-in. white pine stove pipe, with 

 an internal diameter of 6 in, and the out- 

 side lo in. This conveys the water from 

 the ditch at the head over a distance of 

 250 ft. to the wheel. The flume is sup- 

 ported on wood frames. A steel gate for 

 regulating the flow of water is located at 

 the end of the flume just above the wheel. 

 The gate is regulated at the wheel and 

 one setting was found to be sufficient at 

 all times, the head being about 14 ft. The 

 wheel runs at about 9 revolutions per 

 minute and the dynamo is driven at a 

 speed of 900 through a gearing to a counter- 

 shaft. 



A Small Rotary Pump of 

 Novel Construction 



A SMALL rotary pump is very use- 

 ful in a laboratory or for pumping 

 liquids in window-displays. The one illus- 



The rollers turning on the hose press 

 it flat and force the water through it 



trated is of unusual and simple construc- 

 tion. It is very efficient and can be run 

 with a small battery-motor. The casing of 

 the pump is made of wood. The materials 

 required are two pieces 6 in. square and 

 }4 in- thick, one piece 4^ in. long and i in. 

 square, one piece 434 i^- long ^"d i in. 



square and a piece cut like the one shown 

 at A, which is curved along the inside 

 edge to receive the rubber hose, B, that 

 is of ^-in. stock. 



From sheet metal, cut out two pieces as 

 shown at C and solder them to the shaft 

 D, 7/16 in. apart. At the ends of each 

 pair of arms, rollers % in. in diameter are 

 pinioned as shown at E. These rollers 

 should be made of hardwood with their 

 edges slightly rounded to prevent them 

 from cutting the rubber of the hose. The 

 operation of the pump is apparent from 

 the illustration. — E. R. Thomas. 



for 



be 



the 



A Sheet Metal Door-Stop for 

 Swinging Doors 



A DOOR-STOP especially adapted 

 double and single swing doors can 

 quickly made of sheet brass, as shown in 

 illustration. To 

 make one stop 

 it will require a 

 piece of brass 8 

 in . long and 

 about i}/2 in. 

 wide. This is 

 cut in two 



pieces, one piece 



being 5 in. and 



the other 3 in. 



long. Bend 2 



in. of the longer 



piece back to 



form- an angle 



as shown. Drill 



or punch two 



holes in the longer end for screws to fasten 



it to the floor. Make two similar holes, 



one in each end of the short piece, and fasten 



it to the door as a bumper-plate for the end 



of the stop. When the door is opened it is 



automatically held in place. A slight 



pressure of the foot will immediately release 



it. — Jennie E. McCoy. 



Sheet metal stop and 

 bumper on door rail 



A Simple Solution for Cleaning 

 Straw Hats 



STRAW hats can be cleaned with the 

 following mixture: 83 Barium super- 

 oxhydrate; 17 sodium disulphite; 88 borax 

 powder. To prevent the hat from becom- 

 ing hard afterwards, dip it in a solution of 

 glycerine and water (about 10 per cent) or 

 wash it with peroxide of hydrogen. The 

 mixture is applied with a small stiffs scrub- 

 bing brush or a large tooth brush until the 

 straw is bright.— C. F. Oursler. 



