he lower mirror of the infrascope, upon and which are gripped by the inclined ends of arms will represent 100 degrees, or which is réproduced the reflection of the image in the projecting from the _ controlling-lever. About the upper mirror, The sight line of his rifle is also re- sprocket-wheels… … —— ee 8 ee VII. SIMPLE HYGROSCOPE. wheel, hoisting-chains pass, which extend over guide- BY GEORGE M. HOPKINS. No instrument is required to indicate a _ super- pulleys. abundance of humidity in the air. Everyone knows By swinging the controlling-lever in a _ vertical the discomforts of a moist, hot…
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