File:Transactions of the Society of Motion Picture Engineers (1921) (1921) (14785033035).jpg

Identifier: transactionsofso12soci_0 (find matches)
Title: Transactions of the Society of Motion Picture Engineers (1921)
Year: 1921 (1920s)
Authors: Society of Motion Picture Engineers
Subjects: motion pictures
Publisher: Society of Motion Picture Engineers
Contributing Library: Library of Congress, MBRS, Moving Image Section
Digitizing Sponsor: Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division

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waters of the tropics. Before describ-ing the way in which the photographs were secured an outline of theapparatus used will give an insight into the mechanical features ofthe experiments. Several years ago Captain C. Williamson of Norfolk beganworking to perfect an invention that would take the place of theordinary diving suit. It was his idea that some means should bedeveloped by which a man could go down into the water unhamperedby weights and ropes and compressed air and water pressure. Hisexperiments extended over a long time, but finally he was successfuland the government granted him a basis patent. Broadly considered, his apparatus is in three parts; (1) floatingvessel of any suitable design; (2) submersible terminal operatingchaniber in which work or observations can be carried on at thebottom of the water, and (3) a collapsible, flexible tube of metal,connecting the floating vessel and the submersible chamber. The main feature of the invention is the tube. It is made of 150
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Diver at Work on Wreck, Coral Reef in Background. 151 steel in sections of varying lengths. Each section is composed ofan upper and lower flange and these are connected by a set of steelhinges, so arranged as to open and shut along radial lines to the axisof the tube, but at all times to fit against each other so closely as tobe water-tight. Some of the sections have only one set of hingesand when collapsed the flanges rest upon each other. In the longersections there are several sets of hinges joined to each other betweenthe upper and lower flanges. When collapsed they stand aboutthree feet high; they are eight feet long when extended. The sec-tions can be fitted to each other readily, and by this means the lengthof the tube is regulated. Because of the collapsible nature of thesections it is possible to submerge the tube. Any one who has triedto push a large bucket bottom downwards into the water will realizewhat a difficult thing it is to do. With the collapsible tube eachsection j

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