Mast of Velero IV, near Catalina Island, 1949

Three photographs of mast of Velero IV with crow's nest, American flag, and University of Southern California penant, during benthoscope/benthograph operation, Emerald Bay, Santa Catalina Island, Channel Islands, California, USA, 1949 October. Also visible are boom with block and tackle, life preserver, and super structure.

本数据集包含三张拍摄于1949年10月的照片，记录了美国加利福尼亚州海峡群岛圣卡塔利娜岛翡翠湾海域开展深海观察器（benthoscope）/海底摄影仪（benthograph）作业期间的维拉IV号（Velero IV）桅杆。该桅杆设有桅顶瞭望台、美国国旗及南加利福尼亚大学（University of Southern California）校旗，画面中同时可见搭载滑轮组（block and tackle）的吊杆、救生圈与船舶上层建筑。