49.(Pg. [66]) How does its power increase?
50.(Pg. [67]) Why is it rather a compound than a simple power?
51.(Pg. [67]) What common instruments act upon the principle of the inclined plane, or the wedge?
52.(Pg. [67]) Why does a knife cut best when drawn across?
53.(Pg. [67]) The screw has two essential parts; what are they?
54.(Pg. [67]) What other instrument is used to turn the screw?
55.(Pg. [67]) How can you compare the screw with an inclined plane? [Fig. 10.]
56.(Pg. [68]) By what two means may the power of the screw be increased?
57.(Pg. [68]) How do we estimate the power gained by the screw?
58.(Pg. [68]) Is the lever always attached to the nut, as in the figure?