الوسم: Impeller

[ad_1] Sailing and navigation…Measuring Direction and Distance For Measuring distance at sea, the old type of log that gave us the knot as unit of speed has long since given way to more sophisticated mechanical and electronic devices. Walker logs One of the oldest is the Walker log. This uses a torpedo-shaped spinner a few…

[ad_1] Sailing and navigation…Measuring Direction and Distance For Measuring distance at sea, the old type of log that gave us the knot as unit of speed has long since given way to more sophisticated mechanical and electronic devices. Walker logs One of the oldest is the Walker log. This uses a torpedo-shaped spinner a few…