Herd testers collected a sample of milk from each cow at both the morning and afternoon milking, and tested it to determine the fat content. They used the Babcock test, which involved adding sulfuric acid to the milk and spinning it in a centrifuge to separate the fat. Here, a tester is reading the fat content in a sample while a shed hand records the details.
Using this item
This item has been provided for private study purposes (such as school projects, family and local history research) and any published reproduction (print or electronic) may infringe copyright law. It is the responsibility of the user of any material to obtain clearance from the copyright holder.