What was the engineering breakthrough separating Cochrane's design from predecessors?
Answer
Combination of heated water, directed spray, and secure racking
The engineering significance of the 1886 patent lay in its systematic approach to non-abrasive cleaning. The core mechanism focused on using water pressure, not scrubbing. This involved heating the water in an attached boiler, spraying it onto dishes via jets fed from a rotary sprayer underneath, and ensuring the plates were held firmly in place by being positioned vertically within a wire cage. This holistic combination of controlled, heated water application and secure physical support constituted the engineering breakthrough that allowed for effective cleaning without causing the chipping she desperately sought to avoid.

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