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To a large extent the plane-table is used. In the hands of the topographers of the Geological Survey, the plane-table is not simply a portable draughting table for the field; it is practically an instrument of triangulation, and all minor positions of the details of topography are determined through its use by trigonometric construction. The scale on which the map is made is variable.
We wondered what kind of reception we should have, for people's ideas on this point vary greatly. In order not to offend the sultan's prejudices too much, we determined to dissemble, and I decided not to wear my little camera, and Imam Sharif packed the plane-table out of sight.
I used to start first with Imam Sharif, and then my horse, at foot-pace, got so far ahead that the soldiers said, 'We cannot guard both you and the camels. I had then to pull in the horse with all my might. Sometimes I went on with Imam Sharif, one soldier and a servant carrying the plane-table. He used to go up some hill to survey, and I, of course, had to climb too for safety.
If a compass survey will suffice, there is nothing better than the cavalry sketching board used in the United States Army for reconnaissance. With a careful hand it approaches the high degree of perfection attained by the plane-table method. It is particularly adapted for river survey and, after one gets accustomed to its use, it is very simple.
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