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Updated: June 10, 2025
Theoretically the two-stroke and the four-stroke cycle engines possess exactly the same thermal efficiency, but actually this is modified by a series of practical conditions which to some extent tend to neutralise the very strong case in favour of the two-stroke cycle engine.
A magnetic detector was devised by Marconi while other inventors had contrived electrolytic, mercurial, thermal, and other forms of detector, used for the most part with a telephone receiver in order to detect minute variations in the current caused by the reception of the electro-magnetic waves. With one of Marconi's magnetic detectors signals from Cape Cod were read at Poldhu.
Thermal convections; air starts to cool when it gets dark, and then heats up again in double-sun daylight." It was beginning, even now; starting to blow a little after Alpha-rise. "How about the natives?" the lieutenant asked. "If they can get any crazier than they are now " "They can, and they probably will. They think this is the end of the world. The Last Hot Time."
In the year 123 B.C., at some leagues to the north of the Greek city, near a little river, then called the Coenus and nowadays the Arc, the consul C. Sextius Calvinus had noticed, during his campaign, an abundance of thermal springs, agreeably situated amidst wood-covered hills.
'In no part of England could a climate be found more unfavourable for consumptive invalids than that of Florence, a town built in a deep ravine, almost surrounded by the Apennines, and intersected by a squalid river.... Extreme cold in winter, great heat in summer, the prevalence of the northerly winds, the chilling effects of which are not always neutralised by the antagonistic winds, rapid and violent transitions, profoundly affecting the system, even in healthy persons; and combined with these violent atmospheric and thermal variations are also, in similar proportions, hygrometric and electric ever-changing influences. Leghorn, the seaport of Tuscany, is built in a sunk locality, in the midst of a marshy country.
According to the latest scientific views held on the question by such men as Professor Loeb, the appearance of life on the globe was a purely accidental circumstance. The proper elements just happened to come together at the right time in the right proportions and under the right conditions, and life was the result. It was an accident in the thermal history of the globe.
Every motion we see has its thermal value; and when it ceases, its equivalent of heat is an invariable result.
Over and above what has been mentioned, thermal effects have been attributed to the vital activity of the leaves in the transudation of water, and even to the respiration and circulation of living wood. The whole actual amount of thermal influence, however, is so small that I may rest satisfied with mere mention.
Drawn together from a wide ambit by the force of their own gravity, their fall towards the sun's centre must have engendered a vast thermal store, of which 453/454 are computed to be already spent. Presumably, however, this stream of reinforcement is still flowing. In the very act of parting with heat, the sun develops a fresh stock.
I could not succeed in inflaming the small quantities of gas that rise above the thermal waters, or those I collected in a glass phial held over the springs, an operation that excited in me a nausea, caused less by the smell of the gas, than by the excessive heat prevailing in this ravine. Is this sulphuretted hydrogen mixed with a great proportion of carbonic acid or atmospheric air?
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