they made numerous voy- When the cardboard helix is as dry as it can gon, with two sides of equal length intersecting at the ages during the ninth, tenth, and eleventh centuries. made a zero mark is drawn opposite the point of t acute angle and two other sides of equal length inter- The great lug… … In the sultry days of summer we hear a great deal Fig. 1.-SIMPLE HYGROSCOPE. about humidity. This meansgreat discomfort to almost every one. ment is placed in a steamy atmosphere until the in- To be really comfortable on a hot summer's day we dex has moved as far as it will go from the zero mark ;…
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