a statement of the movement of the millworks at the foot of Monticello the water wheel is calculated to turn 8. times in a minute.
Saw mill. the greater cog wheel has 144. cogs
and drives the balance wheel of 12. spurs.
which gives 12. strokes of the saw for 1. of the water wheel
or 12 x 8 = 96 strokes of the saw in 1.'
and drives the balance wheel of 12. spurs.
which gives 12. strokes of the saw for 1. of the water wheel
or 12 x 8 = 96 strokes of the saw in 1.'
Threshing machine.
the lesser cogwheel has 112. cogs.
drives a trundle of 14. rounds
which is 8. for 1. the trundle has a horizontl. cog wheel on same shaft of 48. cogs
which drives the shaft of the drum wheel carrying 12. spurs
which is 4. for 1.
both together give 8 x 4 = 32. revolns. of the drum for 1.of the water wheel
or 32 x 8. revolns. of the drum = 256 in 1'
drives a trundle of 14. rounds
which is 8. for 1. the trundle has a horizontl. cog wheel on same shaft of 48. cogs
which drives the shaft of the drum wheel carrying 12. spurs
which is 4. for 1.
both together give 8 x 4 = 32. revolns. of the drum for 1.of the water wheel
or 32 x 8. revolns. of the drum = 256 in 1'
Grist mill.the lesser cogwheel of 112. cogs
drives a wallower of 26. rounds
on the shaft of which is a cog wheel of 54. cogs
driving a trundle of 16. rounds.
on the shaft of which is a cog wheel of 54. cogs
driving a trundle of 16. rounds.
| 112 x 54 | = | 6048 | = | 14 1/2 revolns. of the millstone for 1. of the water wheel |
| 26 16 | 416 | |||
| or 14 1/2 x 8 = 116 revolns. of the stone in 1'. |
Mill stones grind in proportion to the squares of their diameters.
therefore the work of a 5. f stone is to that of one of 6 f. as 25 to 36.
therefore the work of a 5. f stone is to that of one of 6 f. as 25 to 36.
their revolutions should be in the inverse ratio of their diameters, taking as a basis
that a [illegible] 5 f stone turns 90. times in a minute.then for the revolns. of a 6 f stone
that a [illegible] 5 f stone turns 90. times in a minute.then for the revolns. of a 6 f stone
| say as [illegible] | 6:5 :: 90: | 90 x 5 | |
| 6 | = 75 |
water wheels should also have their revolns in the inverse ratio of their diameters,
taking for a basis that a 12 f wheel should turn 13 times in a minute: then for a 20 f.
taking for a basis that a 12 f wheel should turn 13 times in a minute: then for a 20 f.
| wheel say as | 20: 12 :: 13 :: | 13 x 12 | |
| 20 | = 7.8 |
the best motion for a saw is to make 115 strokes in a minute.
The skirt of every millstone, of whatever size should move with the same
velocity. per Gilmore. but Qu? at 34. f. a second.to wit a 5 f. stone shd.
make 2. revolutions in a second?
velocity. per Gilmore. but Qu? at 34. f. a second.to wit a 5 f. stone shd.
make 2. revolutions in a second?