354 



THE WORLD'S ADVANCE 



tions given. This pitch board and tem- 

 plate may be used on other work than 

 building stairs laying out trusses, raf- 

 ters, braces, etc. 

 Contributed by 



WILLIAM ALBIN. 



Large Drill in Small Press 



Drilling a hole larger than the maxi- 

 mum capacity of a small drill press can 

 be done by turning down the shank of 

 the drill to a size that will fit the chuck. 

 The hole should first be drilled a size 

 smaller than is desired; then the large 

 drill used. This step is necessary, be- 

 cause the speed of the average small 

 press is too fast for a large drill. 



Contributed by 



CHARLES H. ANDERSON. 



A Hint for Lathe Workers 



Work with parallel sides can be easily 

 driven if two pieces, A, A, as shown in 

 the drawing, are added. These pieces 

 can be made from flat, cold-rolled steel, 

 by bending the steel to the desired shape 

 and drilling the bolt holes. These clamps 

 can be adjusted to fit any sized stock 

 within reasonable limits. 



Contributed by C. H. ANDERSON. 



Cutting Glass with Shears 



Sheet glass, provided it is not too thick, 

 can be cut into any desired shape with a 

 pair of heavy shears by submerging the 

 shears and glass in water. The edges 

 may be smoothed afterwards with a file 

 or sandpaper. 



Contributed by 



FRED. W. POTTER. 



A Filter for the Chemist's Laboratory 



To filter large quantities of chemical 

 solutions, an apparatus constructed as 

 follows will give satisfactory results: 



A is a large flask or bottle into which 

 the solution to be filtered is poured. It 

 is inverted so that the ends of the tubes, 

 B and , are some little distance below 



the top of the funnel. The solution runs 

 out of tube C until the rising liquid closes 

 the end B, thus automatically checking 

 the flow. This goes on continually until 

 the whole of the solution has been fil- 

 tered. 



Contributed by 



G. E. WELCH. 



A Chemical Barometer 



Chemical barometers, although not as 

 sensitive as the mechanical type, will 

 indicate changes in weather, and they 

 are unique. A fairly reliable chemical 

 barometer can be made by dissolving J4 

 ounce of powdered camphor, 62 grains 

 of powdered potassium nitrate and 31 



