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Butler was still limiting his share of the work to the mere marking out of the route, leaving Harry to perform the whole of the actual labour of the survey under his watchful eye, and stirring neither hand nor foot to assist the young fellow, although the occasions were frequent when, had he chosen to give a few minutes' assistance at the theodolite or level, such help would have saved young Escombe some hours of arduous labour, and thus expedited the survey.
Here once more they had trouble with the natives, whose intercourse with the Malays had made them adroit and treacherous thieves. Whilst on shore taking some bearings, the party was suddenly surprised, and, beating a hasty retreat, the theodolite stand and Cunningham's insect net were left behind, and immediately appropriated by the natives.
Circumstances had prevented the receipt of portable astronomic instruments which had been ordered from Paris and Munich, and an instrument formed by the adaptation of a vertical circle to the lower part of an excellent German theodolite by Draper, of Philadelphia, was found on its being opened at Metis to have received an injury which rendered its accuracy doubtful.
James on the occasion on which he tried to lay out the line across Chat Moss,—a proceeding which was not only difficult but dangerous. The Moss was very wet at the time, and only its edges could be ventured on. Mr. James was a heavy, thick-set man; and one day, when endeavouring to obtain a stand for his theodolite, he felt himself suddenly sinking.
Afterwards, I went away loaded with a good hundred-weight of Ordnance-maps, which I had stuffed into a bag found in the cloak-room, with three topographical books; I then, at an instrument-maker's in Holborn, got a sextant and theodolite, and at a grocer's near the river put into a sack-bag provisions to last me a week or two; at Blackfriars Bridge wharf-station I found a little sharp white steamer of a few tons, which happily was driven by liquid air, so that I had no troublesome fire to light: and by noon I was cutting my solitary way up the Thames, which flowed as before the ancient Britons were born, and saw it, and built mud-huts there amid the primaeval forest; and afterwards the Romans came, and saw it, and called it Tamesis, or Thamesis.
One man was watching the balloon through a theodolite, an instrument similar to a surveyor's transit built around a 25-power telescope, one man was holding a stop watch, and a third had a clipboard to record the measured data. The crew had tracked the balloon to about 10,000 feet when one of them suddenly shouted and pointed off to the left.
We may therefore note here that when, on the following day, the theodolite was re-fixed, and the man of science and his amateur friend had applied their respective eyes to the telescope, they were assured beyond a doubt that the stakes had moved, some more and some less, while the "Dook's nose," of course, remained hard and fast as the rock of which it was composed.
The ice-floes are quite steady in really thick pack-ice, and the theodolite can be set up and levelled as well as on dry land. The observations, both for latitude and longitude, consist in measuring altitude of the sun or of a star. The chief uncertainty in this measurement is that introduced by the refraction of light by the air.
The notion of navigating the land by precisely the same means as the sea, simple and natural as it was, had not at all occurred to me: but at the first accidental sight of a compass in a little shop-window near the river at Reading, my difficulties as to getting to any desired place in the world vanished once and for all: for a good chart or map, the compass, a pair of compasses, and, in the case of longer distances, a quadrant, sextant or theodolite, with a piece of paper and pencil, were all that were necessary to turn an engine into a land-ship, one choosing the lines that ran nearest the direction of one's course, whenever they did not run precisely.
Theodolite Gulch, The Dip, Canon County, Colorado. Dear Sir: We beg to inform you that the scene of the opening chapter of the Fortunes of Barbara Plynlimmon is laid in Wales. The scene is laid, however, very carelessly and hurriedly and we expect that it will shortly be removed. We cannot, therefore, recommend it to your perusal.
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