126 



Popular Science Monthly 



_CtAR FOR DRIVING 

 MACHINE NO. 1 



SHIFTING BOLTS 



Plan of motor serving two drives. Turning 

 a bolt makes the shift 



One Geared Motor Serves Two Drives 



THIS diagram illustrates a good 

 method for making one geared 

 motor serve two drives. Line up the 

 two large gear-wheels No. i and No. 2, 

 as shown in the diagram. Set the motor 

 so that the motor-pinion falls between 

 them. It must not engage both large 

 gear-wheels at once. As shown here, 

 the motor is driving machine No. i. By 

 simply turning tlie shifting-bolts (usually 

 there is only one shifting-bolt on a 

 motor), the power is (]uickly a[)[)lied to 

 gear-wheel No. 2 for driving machine 

 No. 2.— N. G. Near. 



A Pocket- Clip for Pencils 



A (LIP for holding pencils and foun- 

 tain-pens in the pocket can W 

 made from a paper-fastener. One end 

 of the fastener is straightened and wound 

 tightly about the pen or pencil, while 

 the other end lies flat in a lengthwise 

 position. 





aig=aV iElit-ill— I '' 



Building an Oil Reservoir 



ASIMPLL and useful outfit for the 

 stf)rage of oil or other liciuids is 

 shown in the illustration. A one-hun- 

 dred-gallon range-boiler is shown at C; 

 I '/4-inch air-pipe is connected to the 

 simple pump shown and to the top of the 

 tank (the unions A and B are of the 

 ground-faced kind so that the pipes can 

 be disconnected and laid aside when not 

 in use). The oil barrel 6' is rolled into 

 place and blocked with pieces H and //', 

 the bung removed and the one-inch pipe 

 connected as shown. The valve E is 

 closed, of course. By working the hand- 

 pump the air in the tank will be removed 

 and the oil will flow in to take its place. 

 D is an ordinary water-gage. An en- 

 larged view of the pump is shown in 

 Fig. 2. It is made from an ordinary 

 bicycle pump. Note that the 

 ^ leather cup is reversed as at /. 

 Two /'2-inch check-valves are 

 soldered over holes made in the 

 pump body, since it is impera- 

 ative that the valves be abso- 



A pencil clip is about the cheapest thing in the 

 world to make 



Diagram of a home-built oil reservoir 



lulel\' airtight. Tin- hard rubber com- 

 position-washers should be re[)laced with 

 soft rubber ones. In using the pumj) the 

 plunger should be forced right down to 

 the bottom. — J.\MES E. NoBLE. 



Emptying a Bottle 



THH contents of a bottle m,\\ be enip- 

 lieil, drop by drop, if a in.itch stick 

 bent to form a figure 7 is inserted, by 

 the long end, in the bottle, and held in 

 place. The liquid then runs along the 

 in. Itch stick, when the bottle is tilted, 

 and drops off the end of the stick. 



