| 摘要 |
A differential screw thread press is provided for forming a compacted disc for spectrographic examination purposes by having a pair of opposed threaded bolts in a frame with the bolts having different thread pitches so that they come together as the frame is rotated about the axis of the bolts. The bores for receiving the opposed bolts in the frame are aligned along the same axis and a disc holder is provided for containing the mull to be compacted about the end of one bolt.
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