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  ABDNP200235a03.jpg - Watkins & Hill Ball & Ring Our collection contains a number of Watkins & Hill pieces.  They are all made to a consistently high standard, possibly the best of any 19th century supplier of similar material.  Four are displayed here.  Watkins and Hill were taken over by Elliott Bros. in 1856. This classic demonstration describe by Desaguliers in the early 18th century is both beautifully clear and memorable when performed.  The iron ball is shown to pass through the ring at room temperature.  It is then heated in a gas flame and placed on the ring, where it sits on top, now too large to pass through.  As the ball cools while the spectators watch, it suddenly falls through onto the metal disk below with a definitive 'clang'.  Of course every blacksmith knew that iron expands when heated and used the phenomenon to secure wheels to shafts, rims to wheels and so on. ABDNP:200235a  
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4 | Watkins & Hill Ball & Ring

Our collection contains a number of Watkins & Hill pieces. They are all made to a consistently high standard, possibly the best of any 19th century supplier of similar material. Four are displayed here. Watkins and Hill were taken over by Elliott Bros. in 1856.

This classic demonstration describe by Desaguliers in the early 18th century is both beautifully clear and memorable when performed. The iron ball is shown to pass through the ring at room temperature. It is then heated in a gas flame and placed on the ring, where it sits on top, now too large to pass through. As the ball cools while the spectators watch, it suddenly falls through onto the metal disk below with a definitive 'clang'. Of course every blacksmith knew that iron expands when heated and used the phenomenon to secure wheels to shafts, rims to wheels and so on.

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