The machine was a coffee grinder in use in 1914 (see Figure 2 as well as the supplement for an expert explanation of the coffee grinder’s operation). This machine was made of cast iron with two large wheels on either side. The top of the machine contained a tin with a lid, where one puts the coffee beans into the machine. The beans would then fall deeper in the machine to the grinders. One would need to turn the two large wheels on the side to activate the machine and grind the coffee beans. The grinds would fall out of the machine and get collected in a bin.
Coffee grinder used in this experiment.
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