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Brown - figure 127 | 
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                 Ansicht vergrößern
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                Beschreibung
                 Motion used in air-pumps. On vibrating the lever fixed on the same shaft with the spur-gear, reciprocating rectilinear motion is imparted to the racks on each side, which are attached to the pistons of two pumps, one rack always ascending while the other is descending.  | 
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