TWO:Wind-power, aside from the objections of uncertainty and irregularity, is the cheapest kind of motive-power. Steam machinery, besides costing a large sum as an investment, is continually deteriorating in value, consumes fuel, and requires continual skilled attention. Water-power also requires a large investment, greater in many cases than steam-power, and in many places the plant is in danger of destruction by freshets. Wind-power is less expensive in every way, but is unreliable for constancy except in certain localities, and these, as it happens, are for the most part distant from other elements of manufacturing industry. The operation of wind-wheels is so simple and so generally understood that no reference to mechanism need be made here. The force of the wind, moving in right lines, is easily applied to producing rotary motion, the difference from water-power being mainly in the comparative weakness of wind currents and the greater area required in the vanes upon which the wind acts. Turbine wind-wheels have been constructed on very much the same plan as turbine water-wheels. In speaking of wind-power, the propositions about heat must not be forgotten. It has been explained how heat is almost directly utilised by the steam-engine, and how the effect of heat is utilised by water-wheels in [42] a less direct manner, and the same connection will be found between heat and wind-wheels or wind-power. Currents of air are due to changes of temperature, and the connection between the heat that produces such air currents and their application as power is no more intricate than in the case of water-power.
TWO:"Who told you that it was a portrait of--I mean where did you----"There was a ring at the hall and a servant came in. Gordon hoped that it was not a patient. He was dressed for a party, where he hoped to meet Hetty; not a grand affair, but a few friends in Gilbert Lawrence's luxurious chambers. Bruce looked at the card in his hand.
TWO:Besides the encouragement which it gave to kind offices between friends and neighbours, the Stoic doctrine of humanity and mutual love was honourably exemplified in Senecas emphatic condemnation of the gladiatorial games and of the40 horrible abuses connected with domestic slavery in Rome.86 But we miss a clear perception that such abuses are always and everywhere the consequences of slavery; and the outspoken abolitionism of the naturalists alluded to by Aristotle does not seem to have been imitated by their successors in later ages.87 The most one can say is that the fiction of original liberty was imported into Roman jurisprudence through the agency of Stoic lawyers, and helped to familiarise mens minds with the idea of universal emancipation before political and economical conditions permitted it to be made a reality.
- 水処理薬品
- 簡易?小型貫流ボイラ?貫流ボイラ向けに開発した純正ボイラ薬品。
