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A Photographic Method for Obtaining Accurate Measurements of Animals

Vermont Experiment Station, Burlington, Vermont

ABSTRACT

In connection with certain feeding experiments under the direction of Prof. H. B. Ellenberger,¹ it seemed desirable to obtain photographic records of the size and condition of the animals at frequent intervals. In pictures of this sort which have been made hitherto, the measurements usually have been indicated by a background, placed behind the animal, and ruled off in squares, or by a screen of intersecting wires placed in front of the animal. Both of these methods are open to criticism since they do not give a true measurement. The ruled background makes the animal appear larger than it actually is, while the screen in front reduces the apparent size.

This condition is shown diagrammatically in figure 1. The line CC represents most nearly the true measurement of the animal, the shorter line AB the size indicated by the screen, placed in front, and the longer line A'B' the size as shown on the background.

¹ Head, Department of Animal and Dairy Husbandy, University of Vermont and Vermont Experiment Station.