Scientific American Volume 77 Number 05 (July 1897) . lway, so that the balls are used in acircuit, each operation of the lever lifting the columnof balls one step, and discharging a ball into the ball-way. A detent holds up the column of balls frommoving back with the lever, and a detent device at theupper end of the ball-holding chamber prevents theballs from passing out too freely. A visual signal isarranged adjacent to a shelf on which a lamp or lan-tern may be placed, and comprises a shaft on whichare secured a semaphore or signal arm and light framescarrying panes of colored glass, the s
Scientific American Volume 77 Number 05 (July 1897) . lway, so that the balls are used in acircuit, each operation of the lever lifting the columnof balls one step, and discharging a ball into the ball-way. A detent holds up the column of balls frommoving back with the lever, and a detent device at theupper end of the ball-holding chamber prevents theballs from passing out too freely. A visual signal isarranged adjacent to a shelf on which a lamp or lan-tern may be placed, and comprises a shaft on whichare secured a semaphore or signal arm and light framescarrying panes of colored glass, the signal arm swing-ing horizontally and the frames turning inward on op-posite sides of the lantern as the signal is operated. Theshaft carrying the signal arm is weighted to normallyhold the arm horizontally, a position it assumes whenreleased by a detent actuated by a descending ball, thevisual signal being then exposed until the ball depressesa tilting bar at the bottom, causing the readjustmentof the shaft. The lever by which the signal is actuated. WOODS RAILROAD CROSSING SIGNAL. may be operated in any suitable manner by an ap-proaching train. A portion of the track may be ar-ranged to be depressed by a moving train, and suchmovement of the track may be made to tilt a bell cranklever, connected through other levers and a slide rodwith the lever by which the column of balls is elevated. Photographing Rail Deflections. In an article about the techical applications of photo-graphy by Herr Wilhelm Mtlller, in the Zeitschr. desOesterr. Ing. u. Arch. Vereines for February 5, anarrangement is shown for enabling the deflections ofrails, bridges, etc., under moving loads, to be photo-graphically recorded. Briefly, says the EngineeringMagazine, the apparatus consists of a camera, of whichthe plateholder is fitted to slide across the back byclockwork, so that a series of successive images maybe taken upon one and the same plate at uniform in-tervals of time. The rail or beam to be obser
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