Vintage boat speed indicator. Aquaknot is attached to boating vessel and dropped into water. The drag created moves the indicator depending on the boat's speed. This vintage aquaknot piece is in great condition and includes cable, lead weight, and original wooden box. Indicator calculates speeds up to 10 knots. "David Moffat Myers U.S. Pat. No. 2,152,768. MFD. in 1939 by W.H. Vangaasbeek East Orange, N.J."
