日蚀 - 美国大都会艺术博物馆展品查阅

品名（中）	日蚀
品名（英）	Eclipse of the Sun
入馆年号	1999年，2005.100.614a–g
策展部门	摄影（Photographs）
创作者	W. & F. Langenheim【1843 至 1874】【美国人】
创作年份	公元 1854
创作地区
分类	照片（Photographs）
尺寸	From 3.2 x 2.5 厘米 (1 1/4 x 1 英寸) to 7.2 x 5.9 厘米 (2 13/16 x 2 5/16 英寸)
介绍（中）	1841-42年，威廉和弗雷德里克·兰根海姆在费城开设了一家银版照相馆。这些前记者以技术创新而闻名，他们不是这座城市的第一批，但肯定是这座城市最著名的摄影师。1854年5月26日，兰根海姆兄弟连续拍摄了八张照片，拍摄了自摄影术发明以来北美首次可见的日全食。尽管已知其他六名银谱学家和一名热谱学家记录了这一事件，但只有这七名银谱师幸存下来。在北半球，日食期间，月亮总是从右到左遮蔽太阳；因此，这些图像看起来很奇怪，因为它们像所有未经校正的银版一样，在镜子中横向反转值得注意的是，这些银版都很小，其中三种非常小。为了产生任何类型的图像，兰根海姆夫妇被迫使用可用的最小相机，因为较小的相机所需的光线按比例减少，而且当新月的圆盘遮住太阳的大部分时，几乎没有可用的光线。缺失的第八张图像可能是在较小的盘子上拍摄的，完全没有显示出日全食。
介绍（英）	In 1841-42, William and Frederick Langenheim opened a daguerreotype studio in Philadelphia. Known for their technical innovations, the former journalists were not the city's first but were certainly its most celebrated photographers. On May 26, 1854, the Langenheim brothers made eight sequential photographs of the first total eclipse of the sun visible in North America since the invention of photography. Although six other daguerreotypists and one calotypist are known to have documented the event, only these seven daguerreotypes survive. In the northern hemisphere, the moon always shadows the sun from right to left during a solar eclipse; these images therefore seem odd because they are, like all uncorrected daguerreotypes, reversed laterally as in a mirror. It is noteworthy that these daguerreotypes are quite small, three exceptionally so. In order to produce any kind of image at all, the Langenheims were forced to use the smallest cameras available, since smaller cameras require proportionally less light and there was virtually no available light when the disk of the new moon eclipsed the largest part of the sun. The missing eighth image was probably made on the smaller plate size and showed nothing at all-a total eclipse.