. Bulletin - United States National Museum. Science. 'igure 7 Inn u 01 M' 'in RN I' >u I i cut. using the old screw anil mil hul with a m-w tool. I he material threaded i carl - steel drill rod Smithsonian photo m.1 r6 . Figure 8. Binding si rj w seen at in figure 3, showing the long smooth fadeout of the thread below the shoulder. (Smithsonian photo (9276.) PAPER 37: SCREW-THREAD it [TING BY THE MASTKR-SCRKW Ml Ill. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrati

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. Bulletin - United States National Museum. Science. 'igure 7 Inn u 01 M' 'in RN I' >u I i cut. using the old screw anil mil hul with a m-w tool. I he material threaded i~ carl - steel drill rod Smithsonian photo m.1 r6 . Figure 8. Binding si rj w seen at in figure 3, showing the long smooth fadeout of the thread below the shoulder. (Smithsonian photo (9276.) PAPER 37: SCREW-THREAD it [TING BY THE MASTKR-SCRKW Ml Ill. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.