Scott's Podameter consists of a box, one end of which is higher than the other, so that the foot when being measured may be in the same position as it would occupy in the illustration, Fig. 51. At the lower end of the box is fastened a projection that fits round the back of the foot. This is level with the zero of the paper chart, that is printed like a size-stick scale. Two guides at one end allow the chart to be slipped under, and it is fastened at the other end. A brass rod runs along the other edge of both sides of the box, and permits a jointed pointer to travel to and fro. When a tape is passed round the foot this pointer is moved along until the point is opposite the centre of the tape, and at the base of pointer on the chart a mark is made, thus locating on the chart the longitudinal position of the measurement. The instruments are all made to one scale, and uniformity in measuring the last and the foot is thereby ensured.

* Five-sevenths is more correct.

The Heel-Girth Locater is a simple and, for experimental purposes especially, a very useful piece of apparatus.

Fig 54

Fig. 54.

It consists of a piece of wood large enough to allow the placing on of the foot. At one side, and at the back, a rim is fastened, as C in Fig. 54. The movable brass rod A is made to pivot round a centre that coincides with the inside corner edge of the rim C. A quadrant B, marked with degrees, completes the instrument, with the exception of the guide to prevent the rod A from moving up and down indiscriminately. To use the apparatus, the foot, the heel-measure of which it is desired to locate, is placed on the base-board as shown in Fig. 54. The rod A is adjusted to the position of the heel-girth, and the angle of the rod is read from the quadrant, and recorded.