| Ball diam., mm | 19, 22, 25 |
|---|
Heat
Ball & Ring
Gravesende’s ring is mounted on a tripod stand, the ball with a chain. The cold ball passes through the ring but does not pass when heated.
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Gravesende’s ring is mounted on a tripod stand, the ball with a chain. The cold ball passes through the ring but does not pass when heated.
| Ball diam., mm | 19, 22, 25 |
|---|
