The AUTHOR, in showing a number of lantern-slides illustrating his Paper, remarked that he had prepared it before he knew that its subject would be dealt with by others a t about the same time.1 The subject was evidently, therefore, of current interest, but he hoped that he would be excused if there appeared to be some similarity between his and the other articles.About 8 years ago his firm had been responsible for installing a thermal-electric station in a large industrial factory in Scotland, and, although the owners had not hitherto wished the results of the working of that plant to be published, he was now permitted to give the following results, and to say that the scheme had been found to be most economical in operation. A total of 470 million pounds of steam per year was generated at 300 pounds per square inch and 625" F. (at the turbines), and the pass-out process-steam was delivered a t 84 pounds per square inch and 256" F. The total running cost for 11 million units of electricity sent out was 0.102 penny per unit (including the cost of 21 per cent. of the total quantity of coal used), and the total running cost for process-heat (including the cost of the remaining 79 per cent. of the coal used) was about 0.76 penny per therm. Capital charges and depreciation a t a total rate of 13 per cent. on the present depreciated value (adopted by the Company) increased the cost of electricity by 0.14 penny per unit to a total of 0.242 penny per unit, and increased the cost of processheat by 0.32 penny per therm to a total of 1.08 penny per therm. The overall thermal efficiency was 69.4 per cent.With regard to the proposed industrial town discussed in the Paper, it was of considerable importance, in planning such a town, Appendix 11. Downloaded by [] on [11/09/16].
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