FARM MACHINERY 



229 



stretched, when there is no way of shortening the tubes and 

 filling the cracks. The steel ribbon is no doubt the best of 

 all, as it is affected only by rust. 



Adjustment. The furrow- openers 

 should .have a convenient means of ad- 

 justing the spacing. A double drag-bar 

 is without doubt preferable to the single 

 one. The common spacings of furrow- 

 openers are six, seven, and eight inches. 

 For the average conditions, seven inches is 

 a very satisfactory spacing. Seven-inch 

 drills are usually made with 12 or 18 fur- 

 row-openers. - The latter is a good size 

 suitable for four horses, and will cover 

 three corn rows of 3 }4, feet each. 



Horse Lift. The horse lift for large 

 drills is a great convenience. To be com- 

 plete, the drill should have a grass seed 

 attachment, permitting grass seed to be rdrnTsho^in^ioca 

 drilled with other crops. The footboard box and a steXrij>- 

 is preferred by some to a seat. This is bon tube ' 

 a matter largely of personal preference, but the footboard 

 permits the driver to shift from one side to the other 

 to manage the driving better. A double capacity or auxiliary 

 seedbox may now be had with many drills. This obviates 

 the necessity of filling the seedbox so often. 



Fig. 141. A section 

 of the seed box of 



QUESTIONS 



1. What advantage has the grain drill over the seeder? 



2. Describe the use and construction of hand and wheelbarrow 

 seeders. 



3. How is the grain distributed with the endgate seeder? 



4. Describe the various methods of constructing the seed-box 

 broadcast seeder. 



