Personal identification and description / Francis Galton.

  • Francis Galton
Date:
1888
Catalogue details

Licence: Public Domain Mark

Credit: Personal identification and description / Francis Galton. Source: Wellcome Collection.

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    Ike, tay S WK SS Rg SX IG WA RAN SN SS Section of the apparatus, but the bridges and rods are not shown, only the section of the wires. The apparatus consists, in prin- ciple, of a large number of strips of card or metal ¢ 1, c2 (Fig. 5), say 8 or 9 inches long, and having a common axis A passing through all their smaller ends. A tilting-frame T, which turns on the same axis, has a front cross-bar F (whose section is seen in Fig. 5), on which the tips of the larger ends of all the cards rest whenever the machine is left alone. In this condition a counter- poise at the other end of T suffices to overcome the weight of all the cards, and this heavier end of T lies on the base-board 8. When the heavy end of T is lifted, as shown in Fig. 5, its front-bar F is of course depressed, and the cards being indi- vidually acted on by their own weights, are free to descend with the cross-bar unless they are otherwise prevented. The lower edge of each card is variously notched to indicate the measures of the person it repre- sents. Only four notches are shown in the figure, but six could be em- ployed in a card of 8 or 9 inches long, allowing compartments of 1 inch in length to each of six dif- ferent measures. The position of the notch in the compartment allotted to it, indicates the corre- sponding measure according to a suitable scale. When the notch is in the middle of a compartment, it means that the measure is of medi- ocre amount; when at one end of it, the measure is of some specified large value or of any other value above that; when at the other end the measure is of some specified small
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