Handbook of Railroad Construction; For the use of American engineers. / Containing the necessary rules, tables, and formulæ for the location, construction, equipment, and management of railroads, as built in the United States.

by George L. Vose

An admission of 40 per cent. gives a mean pressure of 80 lbs.,

An admission of 28 per cent. gives a mean pressure of 60 lbs.,

And if the 1st notch of the sector admits, 75 per cent,

And if the 2d notch of the sector admits, 70 per cent,

And if the 3d notch of the sector admits, 65 per cent,

And if the 4th notch of the sector admits, 60 per cent,

And if the 5th notch of the sector admits, 55 per cent,

And if the 6th notch of the sector admits, 50 per cent,

And if the 7th notch of the sector admits, 45 per cent,

And if the 8th notch of the sector admits, 40 per cent,