. Carnegie Institution of Washington publication. . FIG. 4. FIG. 5. FIG. 4.—Detail of ball bearing for steel tubes on the treadmill. FIG. 5.—Step counter. A pulley A is attached to the extended shaft of a revolution counter; a small cord passes over this pulley and is protected by a guard C. The shaft automat- ically stops at B and B'. walking would be very difficult to obtain. A small device was there- fore employed which counted automatically each vertical motion of the body produced in walking. To a belt about the waist of the subject was attached a cord leading over two pulleys on the ceil
. Carnegie Institution of Washington publication. . FIG. 4. FIG. 5. FIG. 4.—Detail of ball bearing for steel tubes on the treadmill. FIG. 5.—Step counter. A pulley A is attached to the extended shaft of a revolution counter; a small cord passes over this pulley and is protected by a guard C. The shaft automat- ically stops at B and B'. walking would be very difficult to obtain. A small device was there- fore employed which counted automatically each vertical motion of the body produced in walking. To a belt about the waist of the subject was attached a cord leading over two pulleys on the ceiling to a small spring which maintained a tension on the cord. The general arrangement of this device is shown in figure 1 and the details in figures 5 and 6. At each step the sub- ject lifted the body a certain distance and lowered it again. Advan- tage was taken of this lifting and lowering of the body to raise and lower a small weight (E, fig. 6) at the end of a cord which rested upon a pulley (A, fig. 5, and D, fig. 6) on the shaft of a revolution counter (see fig. 5). 'See pp. 85 and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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