UNLIMITED Audiobooks and eBooks

Over 40,000 books & works on all major devices

Get ALL YOU CAN for FREE for 30 days!

The First Quarter-Century of Steam Locomotives

Smith Hempstone Oliver

How does All You Can Books work?

All You Can Books gives you UNLIMITED access to over 40,000 Audiobooks, eBooks, and Foreign Language courses. Download as many audiobooks, ebooks, language audio courses, and language e-workbooks as you want during the FREE trial and it's all yours to keep even if you cancel during the FREE trial. The service works on any major device including computers, smartphones, music players, e-readers, and tablets. You can try the service for FREE for 30 days then it's just $19.99 per month after that. So for the price everyone else charges for just 1 book, we offer you UNLIMITED audio books, e-books and language courses to download and enjoy as you please. No restrictions.

Book Excerpt: 
. . .o the grate through a door in the hood, and water was put into the boiler through a pipe in the bottom header. Steam was taken from a 1-inch pipe in the top header. The boiler when new is reported to have sustained with safety a steam pressure of 550 pounds per square inch. The design of the boiler was patented by Stevens on April 11, 1803.

The safety valve (figure 2) is of simple design. It consists of a lever 10 inches long from which a 4-pound lead ball about 2½ inches in diameter is suspended. Beneath the lever, and about 1 inch in from the fulcrum, is a disk valve controlled by the weight of the ball, which hangs by a stirrup that can be moved to any of several notches, so that it can be set for different pressures at which the valve will open.


Figure 2.—Original safety valve of Stevens’ locomotive, now in National Museum.

A small, nonoperable model of the locomotive, about 2 feet long (figure 3), was ma. . . Read More