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Read from the scan by GLM-OCR; expect the odd misread word.
discus throw; the revolutions per minute of the rim probably amount to 22,000. The jets on the bottom of the rim serve to propel the disk vertically upwards; lateral steerage results from switching on and off various jet groups. Appended sketch follows:7
Report, cited by the archive. The PDF is mirrored here; the original link is above. The text was read from the page images by GLM-OCR; expect the odd misread word. 4 pages are in the text index: search them above, or from the library's search.