31. He was a great-uncle of Jesse Ramsden, the scientific instrument maker . 32. However, tuning has varied over time, geographical region, or instrument maker . 33. In 1908 he became an astronomer and instrument maker at the Mount Wilson Observatory. 34. Andrea, Baptista and Jeronimo were all described as musicians and musical instrument makers . 35. Pieter was known as a mathematician, and was also an excellent instrument maker . 36. In the 16th century, European instrument makers were hampered by the materials available. 37. Jack passed on his pipe making skills to the next generation of instrument makers . 38. A range of other mbiras and kalimbas have been created by contemporary instrument makers . 39. Young was first listed in the 1825 Philadelphia directory as a mathematical instrument maker . 40. His mother was an artist and his father a cutler and surgical instrument maker .
