From Mr. Rennie's Experiments

May be taken at 1-6 of the weight up to 40 lbs. per sq. in.

"

1-5

"

"

100

"

Brass on cast iron 1-4

"

"

800

"

Wrought on cast iron 1-3

"

"

500

"

With tallow at

1-10

of the weight.

" olive oil at

1-13

"

800 lbs. per inch forces out the oil.

Friction of journals under ordinary circumstances 1.30 of weight.

" well oiled, sometimes only

1-60 "