Journal of the Franklin Institute; devoted to science and the mechanic arts (1826)
Franklin Institute (Philadelphia, Pa.) · Oxford, Eng. [etc.] Pergamon Press [etc.] · leaf 38
hield o, which is supposed to move air tight. The pressureof the air behind the shield will then urge it forward. This shield, or asMr. Pinkus terms it, dynamic traveller, is connected with guide wheelsmm, which keep the bar S L in the axis of the tube. To this bar is con-nected an upright arm,… … square cord, shown in the figure, E E E, passing over one and under twowheels; the middle wheel lilting the rope as the carriage, V V, proceeds,and the front wheel guiding it to its place upon a groove made to receive it,and thus closing the slit. The car, V V, or governor, as it is termed inthe…
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