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Jan., 1950 hardy : agricultural engineering i->
wrinkling of pneumatic farm tractor tyres. The formation of the wrinkles always takes place in one area of the tyre and if this particular type of tyre deformation is allowed to continue the tyre is soon ruined because the layers of canvas which form the foundation are forced apart and break down.
A mechanical method of recording the beginning of sidewall wrinkling as the pull of the tyre is increased, was not available. The problem was, however, satisfactorily solved by making a film record of the shape of the area of tyre wall where it was known that wrinkling would ultimately take place, showing at the same time, a dynamometer dial which was registering the pull developed by the tyre. The pull at which tyre side-wall wrinkling commenced could then be readily obtained directly from the film and this technique was used for investigating tyres which contained various proportions of water filling and different inflation pressure.
Fig. 3. Time-lapse equipment fitted to Cine-Kodak Special. The drum revolves
once in three seconds ; the studs enable exposures to be made at intervals from
half-a-second to three seconds.
The other main function of this section is to provide a link between the Institute and the outside film world. Specialised films are frequently borrowed from various sources at the request of members of the staff. Instructional films are shown for general information and foreign films are borrowed and sometimes exchanged for the Institute's films. In this way the Institute maintains contact with the work which is being done by similar organisations overseas.
Equipment
As it has been said, all this work is done on 16mm. This meets the demands admirably, both because of its lower cost and size for storage, and particularly because of the portability of the apparatus. Portability is essential because both the camera and projector have invariably to be carried long distances and set up in awkward places. The Cine-Kodak Special camera has proved itself suitable for all this work. A small time-lapse device has been made to couple