water-tube

In 1788 he patented, in England, several forms of boilers, some of which were of the water-tube type.

Steam, Its Generation and Use

In water-tube boilers the draft area is that of the space outside of the tubes and is hence much greater than the cross sectional area of the tubes.

Steam, Its Generation and Use

Safety -- Many of the water-tube boilers on the market are as lacking as are fire-tube boilers in the positive circulation which, as has been demonstrated by Mr. Babcock's lecture, is so necessary in the requirements of the perfect steam boiler.

Steam, Its Generation and Use

As stated in the previous chapter, the first water-tube boiler was built by John Blakey and was patented by him in 1766.

Steam, Its Generation and Use

The advantages of the Babcock & Wilcox boiler may perhaps be most clearly set forth by a consideration, 1st, of water-tube boilers as a class as compared with shell and fire-tube boilers; and 2nd, of the

Steam, Its Generation and Use

Fire-tube boilers from the nature of their design do not permit the variety of combinations of grate surface, heating surface, and combustion space possible in practically any water-tube boiler.

Steam, Its Generation and Use

The reason for this is found in the difficulties involved in the design and construction of water-tube boilers, which design and construction required a high class of engineering and workmanship, while the plain cylindrical boiler is comparatively easy to build.

Steam, Its Generation and Use

The principle was that of the 'water-tube' boilers of the present day.

Chatterbox, 1905. Various

The factor of safety of the boiler parts which come in contact with the most intense heat in water-tube boilers can be made much higher than would be practicable in a shell boiler.

Steam, Its Generation and Use

Dr. Thurston has already been quoted to the effect that the admitted safety of a water-tube boiler is the result of the division of its contents into small portions.

Steam, Its Generation and Use