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In 1826, Goldsworthy Gurney built a number of boilers, which he used on his steam carriages. A number of small tubes were bent into the shape of a "U" laid sidewise and the ends were connected with larger horizontal pipes. These were connected by vertical pipes to permit of circulation and also to a vertical cylinder which served as a steam and water reservoir. In 1828, Paul Steenstrup made the first shell boiler with vertical water tubes in the large flues, similar to the boiler known as the "Martin" and suggesting the "Galloway". The first water-tube boiler having fire tubes within water tubes was built in 1830, by Summers & Ogle. Horizontal connections at the top and bottom were connected by a series of vertical water tubes, through which were fire tubes extending through the horizontal connections, the fire tubes being held in place by nuts, which also served to make the joint.

The awful penalty of success is the haunting dread of subsequent failure, and even sadder still is the fact that in striving eagerly to attain an end, we are apt to lose the sense of the purpose which inspired us. This is more drearily true of the pursuit of money than of anything else. I could name several friends of my own who started in business with the perfectly definite and avowed intention of making a competence in order that they might live as they desired to live; that they might travel, read, write, enjoy a secure leisure. But when they had done exactly what they meant to do, the desires were all atrophied. They could not give up their work; they felt it would be safer to have a larger margin, they feared they might be bored, they had made friends, and did not wish to sever the connection, they must provide a little more for their families: the whole programme had insensibly altered. Even so they were still planning to escape from something--from some boredom or anxiety or dread.

~Titrometric Assays.~--Within the limits of the error of experiment, a definite volume of a solution or gas represents a certain weight of metal or other substance, hence the exact weight may be determined by experiment. The error of experiment may be reduced to insignificant dimensions by repeating the experiment, and taking the mean of three or four determinations. This will at the same time show the amount of variation. Thus, if 0.5 gram of iron were dissolved and found to require 50.3 cubic centimetres of the solution of permanganate of potash, and if on repeating, 50.4, 50.2, and 50.3 c.c. were required, the experimenter would be justified in saying that 50.3 c.c. of the permanganate solution represent 0.5 gram of iron, and that his results were good within 0.2 c.c. of the permanganate solution. So that if in an unknown solution of iron, 50.5 c.c. of the permanganate solution were used up, he could state with confidence that it contained a little more than 0.5 gram of iron. With a larger experience the confidence would increase, and with practice the experimental error will diminish.

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