A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 98
lical thread of a screw without the core. The hollow screwhas a similar helical thread winding within it, exactly adapted tothe interyal between the turns of the thread of the solid screw; Why is the actual effect of the wedge more difficult to be computedthan that of other machines ? Of what… … THE SCREW. JO and thus either part being- made to revolve while the other is keptsteady, motion or pressure may be produced to any extent.* 203. In order to rbtain a correct estimate of the mechanicaleffect of the screw, it will be necessary to develope its construc-tion, from which it will appear…
Physics
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