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Any slope whose gradient is more than 15° may be dangerous under certain conditions, but it may be generally accepted that most long slopes under 25° are comparatively safe so long as they have not much steeper slopes immediately above or below them. New snow is always apt to slip before it has had time to settle down.
He kept as near as possible to the rocky ridge which had sheltered him; for on his other hand the ground sloped downwards in a steep gradient, and the treacherous snow might well conceal many a deadly peril.
Under a low sun, instead of a continuous bright border, we note a wide gap occupied by a dusky rugged plateau, which falls with a gentle gradient to the floor, and is traversed by three or four parallel shallow valleys running towards the S. I can recall no lunar formation which presents an appearance at all like this: one is impressed with the idea that it has resulted from the collapse of the upper portion of the wall, and the flow of some viscous material over the wreck and down the inner slope.
About midway up the mountains the builders came to a solid mass of rock, which presented a barrier that to a surface road was impassable. They determined to tunnel it, and, after an enormous expenditure of labor, finished an inclined tunnel 225 feet in length, of the same gradient as the road.
In a flat district like that through which the Amazon flows, which is almost a boundless plain, the gradient of the river bed is scarcely perceptible. It has been calculated that between Tabatinga on the Brazilian frontier, and the source of this huge body of water, the difference of level does not exceed a decimeter in each league.
As generally arranged, the speed increases from the first notch or starting position to the last notch, movements in the opposite direction changing connections in the opposite order of succession, and, therefore, slowing the car. There is, however, no definite speed corresponding to each notch, for this will vary with the load on each car, and with the gradient upon which it may be running.
The Jamaica Government Railway is admirably designed if regarded as a scenic railway, but is hardly successful if considered as a commercial undertaking. The train winds slowly through the "Cockpit" country; now panting laboriously up steep inclines, now sliding down a long gradient, with a prodigious grinding of brakes and squeaking of wheels.
A daily aerobic program must be started on a carefully managed gradient, using the pulse rate as an regulator, at first raising their maximum heart rate to a point just below 150 percent of its resting pulse and keeping it there for thirty minutes. One can walk, jog, ride a bicycle or use an exercise machine. Actually, everyone should do this, even those with no heart problems.
Whereas, when the border is so situated that the gradient is directed away from it, the interaction is such that positive density makes for darkness, and negative density for lightness.
Immediately at the outlet the canoes were caught by the swift current and for five days we were carried down through almost continuous rapids. There were long stretches of miles where the slope of the river bed was a steep gradient and I held my breath as the canoe shot down at toboggan pace.
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