Vintage brass small pocket compass pictured with 2 other compsses for sale separately may sell together please contact us for pricing etc lovely collectors item 2 1/2 cm round 1 cm tall some age related wear 
The magnetic compass, a crucial navigational tool, has a history stretching back over 2,000 years, originating in China. Early compasses used lodestone, a naturally magnetized mineral, to indicate direction. Initially used for divination and later for land navigation, they were refined by Chinese scholars over centuries. European adoption of the compass followed, with the first recorded use around 1190, and it became an essential tool for maritime exploration. 
Early Development in China:
Han Dynasty (2nd century BC - 1st century AD):
The first compasses were made of lodestone, a naturally magnetized stone, which was used for divination practices. 
Song Dynasty (mid-11th century):
The compass was adopted for navigation, with the invention of magnetized needles suspended in water or placed on a pointed shaft. 
Refinements and Advancements:
Chinese scholars developed techniques for magnetizing iron needles by rubbing them with lodestone or by cooling them after heating them to red-hot temperatures, then orienting them with Earth's axis. 
Introduction to Europe:
Late 12th century:
The compass was introduced to Europe, likely through trade routes from the East. 
Early Uses:
Initial compasses were dry, using a needle or card that rotated freely, pointing north-south. 
Wet Compasses:
As technology advanced, liquid-filled compasses were developed, offering greater stability and precision. 
Development and Standardization:
Gimbal Mounting:
To minimize the impact of ship's movement, compasses were mounted in gimbal rings, which allowed them to remain level even when the ship rolled and pitched. 
Compass Rose:
The compass rose, with its 32 cardinal points (representing winds and directions), became a standard feature. 
Victorian and Edwardian Eras:
Compasses were often made of luxury materials like marble, gold, and silver, serving as decorative accessories. 
Modern Compass Technology:
Liquid-Filled Compasses:
Modern mariners' compasses are typically liquid-filled and use a float to reduce the load on the pivot. 
Binnacles:
Compasses are often mounted in binnacles, which are cylindrical pedestals that contain magnets and steel to neutralize the ship's magnetic field. 
Gyromagnetic Compasses:
Aircraft use gyromagnetic compasses, which incorporate gyroscopes to correct for errors caused by changes in course.