Contributed by C. W. Arbitt, Austin, Texas.
Blue Dye
Prussian blue and Chinese blue are both the same chemically but they do not cut or look the same.
Acetylene lamp
When an acetylene lamp is in good order it will light up slowly with a hissing noise followed by a pure white flame. Should the lamp light up quickly with a yellowish flame, it is a sign of a leak somewhere.
Another Electric Motor
