Page:Popular Science Monthly Volume 92.djvu/302

 286 Popular Science Monthly

Making an Oak Footstool in Asbestos Used in Place of Copper for

Mission Style Laboratory Hoods

���The stool as it ap- pears when finished

��THE footstool shown, differs slightly from the conventional style. It is thoroughly prac- tical and is easy to make. Made in oak, it is a serviceable and pleasing piece of furniture. Select choice material. The ends are cut first. Lay them out carefully, drawing the mor- tices on both sides

so that both sides can be cut. This en- sures a neater and more accurate job. Cut the outline of the ends on a handsaw, following the line closely. The mortises are then cut, working from both sides. After these are ready, smooth the edges; the straight edges with a plane and the curves with a wood file. The side rails are next planed to width and the ends fitted to their respective mortises. Make ^ and fasten in

-^ ■ — ^ place the cleats

which go across the ends to hold the bottom board. Clamp the side rails in

���Details of the oak pieces which enter into the construction of the mission footstool

place as they are to be in the finished piece. Next bore the holes for the l^-m- pins. These pins are cut from the left over scraps of wood. Apply glue in the holes and drive the pins in place. The heads of the pins can be finished with a rounded, flat, or pyramid point as the taste may dictate. Finish the stool with a good standard oil stain.

��IT has recently been found that asbestos can be substituted for copper in con- structing the flue pipes for the hoods, in chemjcal laboratories. It had formerly been thought that nothing but heavy sheet copper would withstand the cor- rosive action of chemical gases and fumes. The present high price and scarcity of copper, however, has made a substitute almost imperative and in constructing some new laboratories in Brooklyn, application was made to a large manu- facturer of asbestos products, for asbestos flue pipes. As a result, pipes square in cross section and consisting of asbestos board 34 in. in thickness were made and installed. These pipes are gas tight and as asbestos is entirely unaffected by corrosive gases, they will undoubtedly last a life time. — Floyd L. Darrow.

How to Make a Force Pump of Pipe and Fittings

WITH a few pipe fittings and pieces of pipe a very serviceable force pump can be con-

��structed that may be used to open up drains, water pipes and the like. The main pipe or pump barrel con- sists of a piece of brass pipe into which a piston is fitted snugly. This piston is op- erated with a small pipe, having a crossbar made of a tee and two pieces of a pipe at the upper end for a handle. The long pipe to

which the pistdn is attached runs through a packing nut fitted into a pipe cap which covers the pipe end. The lower end of the barrel screws into a reducing cross, having connection as shown. Two check valves are attached to the side nipples. Water may be supplied from either or both sides. — C. H. Thomas.

���A force pump made of pipe and fittings

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