Journal of the Society of Motion Picture Engineers (1930-1949)

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298 E. M. WATSON Vol 43, No. 4 the desired performance. As may be seen, this is the conclusion to be drawn after the data have been taken, prepared, and analyzed. The next step is to try to make the changes necessary in the device to accomplish the desired action. It is not always easy to decide just what to do in every instance, because sometimes inventive ability is not adequate for the occasion. However, it is necessary to do what FIG. 6. 37Mm gun mounted on turret truck for test firing. The elevator on which the camera is placed is adjustable in height for various picture sizes. ever seems most desirable to accomplish what is needed. When these changes have been made, the device is again ready for more data to be taken and for the test cycle to be followed through again. It may be necessary to do this several times before arriving at a conclusion of success or failure. If the changes accomplish the desired results, then it can be said that the job is complete so far as the present requirements are concerned, and success has been attained. On the other hand, it may be found that what is desired has not been