Page:Popular Science Monthly Volume 89.djvu/484

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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

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