ONE:Other reasons for the extended and general use of steam as a power, besides those already named, are to be found in the fact that no other available element or substance can be expanded to a given degree at so small a cost as water; and that its temperature will not rise to a point injurious to machinery, and, further, in the very important property of lubrication which steam possesses, protecting the frictional surfaces of pistons and valves, which it is impossible to keep oiled because of their inaccessibility or temperature.
FORE:Notwithstanding the importance of this impulse, it does not represent the whole effect produced by Protagoras on philosophy. His eristic method was taken up by the Megaric school, and at first combined with other elements borrowed from Parmenides and Socrates, but ultimately extricated from them and used as a critical solvent of all dogmatism by the later Sceptics. From their writings, after a long interval of enforced silence, it passed over to Montaigne, Bayle, Hume, and Kant, with what redoubtable consequences to received opinions need not here be specified. Our object is simply to illustrate the continuity of thought, and the powerful influence exercised by ancient Greece on its subsequent development.
FORE:The relation between the feeding and cutting motion of reciprocating machines is not generally considered, and forms an interesting problem for investigation.
