Q:I know that the answer to the question "How was the tool to used in preparing for floods?" is in "The tide-predicting machine invented by Sir William Thomson in 1872 was of great utility to navigation in shallow waters. It used a system of pulleys and wires to automatically calculate predicted tide levels for a set period at a particular location.". Can you tell me what it is?
A:
predicted tide levels for a set period at a particular location