Information Pertaining to the Motion Pictures of the Seaworthiness Tests of the Mohole Platform

摘要

Two 16mm Mitchell movie cameras were used to obtain motion pictures for almost every test run. Camera Number 1, mounted in a fixed position, was equipped with a grid in front of its lens to aid in visually estimating the model motions. Camera Number 2 was mounted so that it could rotate about the vertical and horizontal axes. Thus this camera could follow the model as it changed its position relative to the carriage. The movies were made at a speed of 108 frames per second so that when they are projected at a speed of 16 frames per second, the motions will occur at prototype frequency. This high film speed limited the time that the cameras could be operated during any one test. Consequently tests in a particular sea state as recorded photographically may not be truly representative of the motions for that sea condition since the sampling was necessarily limited. A list showing the run number, draft, heading, wave height, wave length (or sea state), as well as brief remarks concerning the movies is presented. The movies are spliced in the following order: (1) grid camera, (2) title, (3) moving camera. (Author)