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.
স্যার উইলিয়াম থমসনের টাইড-প্রেডিকশন মেশিন কি কাজ করত?
system of pulleys and wires