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| 0138 |
Tibet and Turkestan : vol.1 |
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be lost. But when a thorough search of all our kit
at the lake encampment failed to find the precious
book of figures, I knew that latitudes also must be
rare.
Even a very exact determination of position
would not have given us a trail, but could have
determined general directions toward an objective
and the distance to be traversed. As things were,
we had nothing save compass readings for guidance.
My instrument was small, not well made, and I did
not know the magnetic variation on the Tibetan
plateau. Experience had taught me in other jour-
neys that results, sometimes remarkably accurate,
may be had by compass work, assuming an average
rate for caravan speed. This must vary with the
animals used. Thus, Somali camels go steadily at
about two and a quarter miles per hour; Abyssinian
mules may be counted to do three miles per hour
over anything but very rough country. Our Tur-
kestan ponies, as we had determined on the lower
desert, were good also for three miles. And this
figure was, for a time, assumed on the plateau,
making specific allowance for all stops over one
minute. It proved to be too high, the animals
being slowed down by the rarified air and equally
rarified food.
During the first five days beyond the pass the
error of magnetic variation was of small account, as
our course had been generally southward with ap-
proximately equal east and west diversions. It be-
came serious on the long westerly course soon to be
pursued. The compass course pointed a wavering
and inaccurate path across the untracked wastes.
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