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 



