排序方式： 共有36条查询结果，搜索用时 31 毫秒
31.
Gerald Mundigler Julia Mascherbauer Marie-Theres Kasimir Jutta Bergler-Klein 《Wiener klinische Wochenschrift Education》2009,4(2):91-111
Ohne Zusammenfassung 相似文献
32.
33.
34.
35.
36.
Schickore J 《Endeavour》2003,27(3):134-138
In the 1820s, certain minute objects began to be used regularly as tests for microscopes. Scales of insects, animal hairs and tiny leaves served as convenient means to assess their optical performance. It was a peculiar conjunction of optics, astronomy and natural history that formed the intellectual background for the emergence of the tests; and their establishment was greatly facilitated by the culture of conversation and competition in which microscopical practice was embedded. The introduction of the tests soon gave rise to a peculiar and highly productive interaction: the application of test objects incited instrument makers to aspire after technical improvements. These pursuits led, in turn, to a differentiation and refinement of the tests themselves, which then again suggested specific kinds of improvements. Historians have paid only scant attention to these issues. But the early history of test objects deserves thorough investigation. In fact, it provides a key to the understanding of the intellectual and social contexts and the dynamics of microscopy in early 19th-century Britain. 相似文献