tube ELECTRICAL GYROSCOPES. is producing rays, becoming white hot under its ter- BY HOWARD B. DAILEY. rific bombardment from the cathodic streams. But The advantages of a gyroscope whose action can be others hold that these streams, upon striking the maintained for any desired length of time are… … lengths, are fitted into parallel grooves in herewith a hand in which is a needle. Be- the opposite sides of a 2-inch hollow wooden fore the stereoscope the appearance of solid- ball; and are secured in place by a slender ity in these pictures is remarkable. The In the static machine many changes…
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