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Scientific American, Vol. 43, No. 18 (1880) (1880)
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sheet of paper upon which | ‘will be spread out and leveled as the car is drawn forward | construction. the movements of the needle are to be recorded. This cy- ‘after the discharging of the train. As soon as the leveling} Further information may be obtained by addressing the |linder is of brass,… … ANDREWS’ LEVELING ATTACHMENT FOR EARTH CARS, © 1880 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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