290 GLOSSAET. 



two drums or cylinders ; as in the endless chain or tread-powers to 

 thrashing machines. 



Endless screw, a screw working in a toothed wheel or cog-wheel, 

 and imparting a motion to the wheel equal to the advance of one tooth 

 to each revolution of the screw. 



Epicycloid, see Cycloid. 



Efioycloidal wheel, a wheel with cogs on its interior rim, fitting 

 into another cog-wheel precisely one-half its diameter, for converting 

 circular into alternate motion ; any point in the circumference of the 

 smaller wheel, while in motion, describing a straight line. 



Evener, the central or larger wliiffle-tree of a set of wlnflSe-trees for 

 two horses, called also a double-tree. 



Fan, the vane of a wind-mill, to keep the sails facing the wind. 



Feather, the thin cutting part of a plowshare, on the right-hand side. 



Felloe, or Felly, the circumference or rim of a wheel, or a segment 

 of it, into which the spokes are inserted. 



Ferrule, a ring or band on the end of a wooden rod or bar, to pre- 

 vent splitting. 



Female screw, a hole cut w^ith the threads of a screw, into which a 

 screw fits. 



Finger-bar, that portion of the cutting-bar of a mowing or reaping 

 machine, in which the knife-bar works. 



Flange, a projection from the end of a pipe or from any piece of 

 mechanism, so as to sci-ew to another part ; a term also applied to the 

 projection of a car-wheel to keep it from running off the rail. 



Flash-wheel, a water-wheel used for elevating water, resembling a 

 breast-wheel with a reversed motion. 



Float-board, one of the boards forming the exterior of a water- 

 wheel, against which the stream of water dashes. 



Flume, the water passage of a mill, usually a box of plank. 



Fly-wheel, a wheel with a heavy rim, for retaining inertia and equal- 

 izing the motion of machinery. 



Foot-valve, a valve in a steam-engine, opening from the condenser 

 towards the air-pump. 



Force-pump, or Forcing-pump, a pump with a solid piston, Avhich 

 drives instead of sucking water. 



Friction-wheel, made by two wheels overlapping each other, and 

 bearing between them the axle or journal of another wheel, thus dimin- 

 ishing the friction of the latter. 



Fulcrum, a support; applied to the support used for the lever, in 

 raising weights. 



Furrow slice, the strip of earth thrown out by the plow at a passing. 



Furrows, flat and lapping; when the slice is laid flat or level, and 

 when the edge of one overlaps the preceding, respectively. 



Gang-plow, a compound plow made of a series of plows running side 

 by side. 



Gavel, a sheaf of grain reaped but not bound. 



