You might be interested in the analog computers that were used to compute tide tables back in the day. It's quite fascinating how they even managed to do basic

You might be interested in the analog computers that were used to compute tide tables back in the day. It's quite fascinating how they even managed to do basic Fourier transforms without electricity: https://www.youtube.com/watch?v=IgF3OX8nT0w https://www.youtube.com/watch?v=IgF3OX8nT0w