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Cattle Callipers

Dairy Husbandry Section, Experiment Station, Ames, Iowa

ABSTRACT

In the measuring of cattle for experimental purposes the fundamentals demanding greatest attention are accuracy, speed, and convenience. It was found by the Dairy Husbandry Section of the Iowa Agricultural Experiment Station in conducting work requiring the skeletal measurement of a considerable number of animals that much time was required in making these determinations with any degree of accuracy.

The feature which caused the greatest delay was the clamping and releasing of the moveable arm on the calliper as the clamp was controlled by a thumb screw, and to avoid this difficulty a standard and two callipers were constructed according to the accompanying designs and specifications. The complete set is illustrated in figure 1, while figure 2 shows the details of the clamp used on each moveable cross-arm.

Specifications

The graduated bars and the cross-arms are made of -inch hard maple finished with shellac, while the plates used to connect the fixed and moveable cross-arms with the graduated bars are of inch brass.