These currents are furnished by an alternator which transmits sine currents over the line and operates a motor at the distant end of the line, both machines running in synchronism.
Huxley questioned the time value of fossils, but recent research has tended to show that identity of species and of mutations is, on the whole, a guide to synchroneity, though the general range of vertebrate and invertebrate life as well as of plant life is generally necessary for the establishment of approximate synchronism.
This cylinder is driven at a slightly lower speed than that of synchronism.
If the rates of vibration of the two tuning-forks at the two stations could be maintained precisely the same, the two arms would rotate in synchronism, but as this uniform vibration cannot be exactly A / 4 3/ Line /‘ --- /4 -- ?
Passing by certain fragments of stone vessels, found at Cnossus, and coincident with forms characteristic of the IVth Pharaonic Dynasty, we reach another fairly certain date in the synchronism of remains belonging to the XIIth Dynasty (c. 2500 B.C. according to Petrie, but later according to the Berlin School) with products of Minoan Period II.