running the rafter level through a field to guide the ploughs horizontally, Thruston makes a step of the level (10 f.) every minute, which is 600. f. = 200. yds an hour.
Farm Book, page 123
by Thomas Jefferson
by Thomas Jefferson
Miscellanies.
to bring the wheels of my Phaetons & chairs to an uniform measure, let the arms of the axles be always 10 1/2 I. between the shoulder & linch pin, 1 3/4 I. diam. at the shoulder, & 1 1/4 I. diam. at the inside of the linch pin, or washer.
1810. Jan. 9.
Jan. 9.
In terrassing the new nursery in 4. f. terrasses, 2 men do 50. yds in length a day.
1811. Apr. 29.
we find that in blowing rock it takes 2. oz. of powder to a blast, taking one depth of hole with another.*
1812. Aug. 5.
2. bars of tin weighing 12.8 oz. or 3/4 lb each have tinned 18. stewpans being our whole number. then it takes 1. lb to tin a dozen stewpans.
Oct. 20.
3 men & 3. lads get 550. bolts of stave timber for flour barrels in a day. each bolt makes 4. staves or heading pieces, & 25 staves & heading pieces make a barrel.
*1813, 1814.
in blowing on the river road at the foot of Monticello, I found pretty accurately that each borer used 1/4 lb powder a day, & bored 3 holes of 12 I. each a day. this gives 1 1/3 oz. to the blast
1817. Aug. 2.
Colclaser says that a man saws & rives the timber & dresses compleatly for setting up staves for 250. barrels a day, 17. staves to a barrel.