Thomas Jefferson’s Notes on the Peacock Plow, October 1814
Notes on the Peacock Plow
Smallest Peacock plough.
| beam. | 4 f–5.I long, breadth vertical 3.I ¼ |
| thickness horizontal 2½ |
| height of beam from | ground behind 12¼ |
| before 15½ I. |
length of handles 4.f.
their opening at top 21.I.1
angle of their elevation from the horizontal line 33°
thickness of iron mould board ⅜ + 1/16
| share & bar |  |
| mould board |  |
the mould board as it sets on the share leaves a cutting margin of 3.I. behind, i.e. at the tip of the wing and 2½ I. broad at the toe of the mould board of course the block of which it is formed is but 6¾ wide at bottom. 
it is 2 f long & 10.I. high. and must be 11 I. wide at top. the heel of the mould board is 8¾ from the left side of the bar, it’s hinder and upper tip is 13 I. from the perpend. of the left side of the bar. it’s cast therefore is 4¼
1814. Oct. these mould boards cast for me at Richmond weigh 18℔ 2.oz.
MS (ICN: Thomas Jefferson Letters); entirely in TJ’s hand; written on a scrap in two sittings, with the first entry undated and the second partially dated.
For the twenty-four moldboards cast for TJ at richmond, see TJ to John Staples, 4 May 1814, and note to TJ to Patrick Gibson, 15 Aug. 1814.
1. Line interlined.