Chap. XXL Of the Wheat-Drill • 363 



Parts of this double Hopper at a right Diftance, which 

 is, when there is Ten Inches clear room betwixt the 

 Two fingle ones. The Spindle E, palling thro 5 the 

 Whole, holds the Two fingle Hoppers by Four 

 Wreaths, at the fame Diftance below, as they are 

 held by the Bar above. 



Thefe Four Wreaths are fcrewed on to the Spindle, 

 to keep it from moving towards either End, as well 

 as to hold the Hoppers in their Places : Two of which 

 Wreaths are feen at a and b, and the other Two are 

 placed on the Outfides, as thefe Two are on the In- 

 fides. Before we proceed any farther in this Figure, 

 it will be proper to fhew the Wreaths, which are of 

 Two Sorts. 



The one in Fig. 16. where A is its Hollow, which 

 is circular, and muft be of the fame Diameter with 

 the Spindle; and, being thruft on upon the Spindle, 

 till it touch the Board, is fattened to the Spindle by 

 a fmall Screw thro' each of its oppofite Holes, a b 

 fhews the Breadth of this Wreath, whether it be made 

 of Brafs or Wood : It is little more than half an Inch. 

 b c d is the Part of it that goes againft the Board : 

 The Thicknefs of the Surface of this End which goes 

 againft the Board, is a quarter of an Inch, if made 

 with Brafs ; but if with Wood, half an Inch ; but 

 the Thicknefs of its other End a e f is lefs than its 

 End b c d y by which means the Screws are the more 

 eafily turned in, 



Fig. 17. fhews the other Sort of Wreath, which 

 is always made in Brafs : Its Cavity is a hollow Cylin- 

 der like the former : When it is on the Spindle, its 

 End a b c is thruft into the Hole of the Board (made 

 wider for the Purpofe) until d e f come clofe to the 

 Board, and (top it from entering any farther 9 then 

 We fcrew it on to the Spindle by the Holes, as the 

 other Sort of Wreath is defcribed to be fcrewed. 



This is the beft Sort of Wreath ; becaufe it keeps 

 the Spindle from wearing againft the Edges of the 



Hole, 



