DIGITAL ARCHIVE of SLAVERY to FREEDOM at MONTICELLO   (beta)

II. Farm buildings & Conveniencies

Threshing machine.

cogs		rounds				I	diam.
1st wheels.	56.	: 11	is	5. for 1.	at about 4½I. making	254.5 circumference	= 81.9
2d	36	: 9		4. for 1.		122.5 circumference	= 39.9
3d	30	: 6		5. for 1.
				100. for 1.

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a Threshing machine to be worked by 2. men. single geered.

the spur wheel about 4.f. diam. 50. cogs. the wallower on the Drum wheel 6. rounds which is 8⅓ for 1. they turn the cogwheel 15. times a minute.

15 × 8⅓ = 12.5 revolutions of the Drum wheel in a minute.

2. men got out nearly 1½ bush. of clean wheat in. half an hour, it would have been full 1½ but for waste.

it would take 4. men & a girl to work, and they would get out about 40. bushels in 12. hours, when the machine comes to work glib. & smooth. one may say on the whole that it gets out the double of what the same men could thresh. but infinitely cleaner. there did not appear to be 1. grain in 100. or 150. left in the straw.

Houses for Laborers.

Davy & Lewis & Abram have done the carpenter’s work of Bagwell’s house in 6. days, getting the stuff & putting it together.

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the Outfield granary took 24. days work to get the logs, rafters & slabs & put them up completely. it may be valued then @ 48/ exclusive of floors & doors.

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1810. Aug. the threshing machine I am now erecting at Tufton is as follows.

the	horsewheel has	128.	cogs.it’s wallower	23. rounds. which gives	5.5652. turns for 1.
	Spurwheel	60.		16	3.75
	bandwheel	92.	Inches. diameter. whirl	22.I	4.1818

5.5652 × 3.75 × 4.1818 =	87.272	turns of Drum for 1. of the horsewheel.
the diameter	3.	beaters, or strokes at every revolution
	261.816	strokes for every turn of the horse wheel

the diameter of the drum is 5. feet,	it’s circumference 15.708 f
the diam. of the horse circle is 28.f.	it’s circumference 88f he performs it in 29” @ 3f pr second

the velocity then of every a beater is to that of the horse as 15.708 × 87.272 : 88 or as 15.5 : 1 to wit 46f. in a second.

1814. Sep. this machine gets out 170.b. a day, working as in ordinary, with 5. or 6. horses.

Oct 6. the treble geered machine at Lego got out 66. bushels in a day, with 3. horses & 2 mules.