...applied, the force to overcome the weight and friction is Wd (tn—f} : ^n~t) D, where the letters exprefs the fame things as before, and the upper fign is for...of the threads, and a plane at right angles to the axis of the fcrew; or it is equal to the diftance of the refpe£tive edges of two threads, divided...

...the force to overcome the weight and friction it Wd (/»=:/) : (» = /) D, where the letters exprefs the fame things as before, and the upper fign is for...moving, and the lower for the fufpending force. NB / is the natural tangent of the angle made by a line touching one of the threads, and a plane at right...

...applied, the force to overcome the weight and friclion is Wd (/wrty): (w=r=/) D, where the letters exprefs the fame things as before, and the upper fign is for...of the threads, and a plane at right angles to the axis of the fcrew j or it is equal to the diftance of the refpedtive edges of two threads, divided...