A 19th-century navigation marvel: The mechanical speedometer at the “Surakhani” ship-museum
According to sea-news.az that while modern ships measure speed and distance using cutting-edge digital technology and professional navigation systems, 19th-century sailors relied on entirely different and fascinating mechanical devices. One such unique instrument is the mechanical speedometer designed in the shape of a harpoon, known as the “Harpoon Log.”
Working Principle: This device was deployed into the water behind the ship. As the vessel moved forward, the water resistance caused the harpoon to rotate. A special mechanism on the device calculated these rotations, automatically recording the distance traveled in nautical miles via the indicators on the dial. This method was used to determine the ship’s speed.
Exhibit Specifications:
- Name: Mechanical Speedometer (Harpoon Log)
- Place of Manufacture: Birmingham, England (Bearing serial number 3380 and the “A1” hallmark indicating high quality)
- Date: 1862–1863
- Material: Metal, housed in its original beechwood case
- Dimensions: 54 × 13 × 13 cm
Exhibited in the “Navigation and Communication” hall of the “Surakhani” ship-museum—the world’s first tanker-museum—this artifact provides visitors with a vivid demonstration of the historical evolution of maritime technology.
Through the Surakhani Ship Museum tour video, you can virtually explore the museum’s interior halls, ancient navigation tools, and other unique exhibits in detail.
