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Popular Science Month!;/ 



An Efficient Tin Pump 



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Diagram of Framework BeforeAssembling, 



Indicating Proportions and Process of 



Construction 



At the Rear End of the Arms Three Plugs 



Are Mortised In. In front of These the 



Cross Stick Rests 



large enough to fit the chair. It should 

 not be flush with the front rail, but an 

 allowance of K "i- should be made for 

 tJie covering. Upholstering springs can 

 be bought to fit the frame. After 

 nailing on the springs, cover the frame 

 with a particularly strong piece of burlap 

 or canvas. 



On top of the canvas, spread about a 

 pound of cotton felt, moss, or hair, and 

 cover the whole with leather or a good 

 quality of imitation leather, which can 

 be tacked underneath the frame of the 

 seat. Use 6-oz. upholstering tacks. Be 

 sure to stretch the leather and see that 

 no wrinkles are formed. For the back 

 sew up a cushion and stuff it with 

 cotton felt. When cutting the material 

 for the cushion make it about 3 ins. 

 wider than the distance between the 

 arms, so as to allow for the seam and 

 the stuffing which tend to contract the 

 cushion. This additional width also 

 gives the cushion space to spread when 

 a heavy person sits in the chair. 



This comfortable chair will present an 

 excellent example of craft^nianshiii and 

 will make a fine Christmas gift, the 

 season for which will be here almost 

 before you can realize it. So it is none 

 too early to get busy at the work- 

 bench. — Anton Buchuindkr. 



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A TIN pump can be made by taking 

 a piece of brass tubing two ins. 

 thick and seven or eight ins. long for the 

 cylinder. A piece must be turned in the 

 lathe to stop up one end and furnish a 

 bearing for the cylinder to rock upon. 

 Next a plunger-rod and jjiston should 

 be made. 



The best way to make the piston is 

 to turn out washers about 3/ 16 ins. thick, 

 with one slightly smaller than the inside 

 diameter and the other H in. smaller to 

 allow for the leather cup. Both of 

 these washers should be tapped with a 

 thread. 

 The plunger-rod is made about one 

 inch longer than the stroke and a hole 

 14 in. is drilled in the outer end. A small 

 cap or guide for the piston-rod is then 

 turned to fit in the cylinder and is held 

 in place by three screws. A hole ^4 in. 

 is then bored at the base of the pump 

 and a small tube soldered or threaded in 

 to carry the rubber hose. These fittings 

 can be taken from an old discarded bi- 

 cycle pumj). 



Next a Ijoard eighteen ins. long and 

 five ins. wide is used. A piece of band- 

 iron I by 3/16 is bent and drilled to act as 

 a bearing for the pump. A handle three 

 feet long is shaped and two iron bands 

 drilled and bolted at the base to form a 

 bearing for the handle to rock back and 

 forth and carry the i)ump-rod. A small 

 slit is cut al)out eight ins. from the base 

 of the handle and a bolt is nm through. 

 This is to hold the pump-rod. A bent 

 iron bearing is made for this handle the 

 same as for the pump itself. 



The amount of leverage can be 

 regulated by the length of the handle 

 and the distance of the i)lunger-rod from 

 the base. This puniji lakes about one- 

 half the energy that 'an ordinar\' tin 

 pump reciuiri'S. 



The Pump Completed 

 and Ready for Oper- 

 ation. The Amount of 

 Leverage Is Regulated 

 by the Length of the 

 Handle and the Dis- 

 tance of the Plunger 

 Rod from the Base. 

 For Ordinary Use the 

 Length Is About 

 Three Feet 



