Caliber compasses. Engraving of a diagram of a pair of caliber compasses. These were used to assess the size and thus the weight of projectiles such as cannon balls and to measure the interior diameter of gun barrels. This plate was published in George Gregory's A Dictionary of the Arts and Sciences,printed at London in 1807 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Middle Temple Library |
Bildgröße: | 4257 px × 4068 px |
Modell-Rechte: | nicht erforderlich |
Restrictions: | - |