Staple Dietary Ingredients Secured | My Web Site Page 059 Chapter 03 Page 01

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The rougher the method of assay adopted, the larger should be the quantity of ore taken. If the degree of accuracy attainable with the methods and instruments at the assayer's service is known, it is easy to calculate what quantity should be taken for any particular case. If the results are good within 0.001 gram, then, taking 1 gram of ore we can report within 0.1 per cent., or if they are good within 0.0002 gram, taking 20 grams of ore, we can report within 1 part per 100,000, or very closely within 6-1/2 dwt. to the ton. If it is wished to be yet more particular in reporting, larger quantities must be taken. The difficulty of manipulating very small or very large precipitates, &c., must be borne in mind. So, too, must the fact that the greater the weight of the final product of an assay, the less, as a rule, is the percentage error. The distinction between absolute and percentage error, often overlooked, is important. If 0.5 gram of silver be cupelled with 20 grams of lead, there may be obtained a button of 0.495 gram; the absolute loss is 0.005 gram, and this equals 1 per cent. of the silver present. Similarly, cupelling 0.1 gram, the resulting button may be 0.098; the absolute loss is only 0.002 gram, but this equals 2 per cent. of the silver present. In the same way the student should see that the two results, 91.5 per cent. and 92.0 per cent., are really more concordant than the results 9.1 per cent. and 9.2 per cent.

The question has been raised in connection with the cross drum design of the Babcock & Wilcox boiler as to its ability to deliver dry steam. Experience has shown the absolute lack of basis for any such objection. The Babcock & Wilcox Company at its Bayonne Works some time ago made a series of experiments to see in what manner the steam generated was separated from the water either in the drum or in its passage to the drum. Glass peepholes were installed in each end of a drum in a boiler of the marine design, at the point midway between that at which the horizontal circulating tubes entered the drum and the drum baffle plate. By holding a light at one of these peepholes the action in the drum was clearly seen through the other. It was found that with the boiler operated under three-quarter inch ashpit pressure, which, with the fuel used would be equivalent to approximately 185 per cent of rating for stationary boiler practice, that each tube was delivering with great velocity a stream of solid water, which filled the tube for half its cross sectional area. There was no spray or mist accompanying such delivery, clearly indicating that the steam had entirely separated from the water in its passage through the horizontal circulating tubes, which in the boiler in question were but 50 inches long.

John's preparations alarmed the barons, and they determined not to wait for April 26, the appointed day for the king's answer. They came together in arms at Stamford, advanced from thence to Northampton, and then on to Brackley to be in the neighbourhood of the king, who was then at Oxford. Their array was a formidable one. The list recorded gives us the names of five earls, forty barons, and one bishop, Giles de Braose, who had family wrongs to avenge; and while the party was called the Northerners, because the movement had such strong support in that part of England, other portions of the country were well represented. Annalists of the time noticed that younger men inclined to the side of the insurgents, while the older remained with the king. This fact in some cases divided families, as in the case of the Marshals, William the elder staying with John, while William the younger was with the barons. That one abode in the king's company does not indicate, however, that his sympathies in this struggle were on that side. Stephen Langton was in form with the king and acted as his representative in the negotiations, though it was universally known that he supported the reforms asked for. It is probable that this was true also of the Earl of Pembroke. These two were sent by John to the barons to get an exact statement of their demands, and returned with a "schedule," which was recited to the king point by point. These were no doubt the same as the "articles" presented to the king afterwards, on which the Great Charter was based. When John was made to understand what they meant, his hot, ancestral temper swept him away in an insane passion of anger. "Why do they not go on and demand the kingdom itself?" he cried, and added with a furious oath that he would never make himself a slave by granting such concessions.

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