Various - Harper's New Monthly Magazine, Vol. V, No. XXIX., October, 1852

As we have already mentioned, an Arab chieftain who accompanied the expedition, had been sent round to the eastern side of the sea to the town of Kerak, which was situated, as will be recollected, at the head of the valley beyond Zoar, to negotiate with the natives and to procure provisions, and a day had been appointed for him to come down to the shore, at a certain point on the peninsula, where a boat was to be sent to meet him. When the time arrived for fulfilling this appointment, Lieutenant Lynch organized a party for the excursion, and embarked for the eastern shore. On approaching the land at the appointed place of rendezvous, they saw an Arab lurking in the bushes, apparently watching for them, and soon afterward several more appeared. At first the voyagers doubted whether these were the friends whom they had come to meet or whether they were enemies lying in wait to entrap them. On approaching nearer to the beach, however, they soon recognized Akil. He seemed greatly rejoiced to see them. He informed them that he had been kindly received at Kerak, and he brought down an invitation to Lieutenant Lynch, from the chieftain that ruled there, to come up to the valley and make him a visit. After some hesitation, Lieutenant Lynch concluded to accept this invitation. He encamped, however, first on the shore for a day or two, to make the necessary explorations and surveys in the neighborhood. During this time he went out with two Arabs across the plain, to examine the supposed site of ancient Zoar. He found ruins of an ancient village there, and fragments of pottery, and other similar vestiges on the ground. At length, on the morning of the third day, leaving his boat in the care of a guard, he put himself and his party of attendants under Akil's guidance, and set out to ascend the valley. The party were fourteen in number. The sailors were mounted on mules. The officers rode on horseback. The cavalcade was escorted by a troop of twenty armed Arabs – twelve mounted and the rest on foot.

They found the valley which they had to ascend in going up to Kerak, a gloomy gorge, of the wildest and grandest character. The path was steep and very difficult, overhanging on one side a deep and yawning chasm, and being itself overhung on the other with beetling crags, blackened as if by fire, and presenting an aspect of unutterable and frightful desolation. To complete the sublimity of the scene, a terrific tempest of thunder, lightning, and rain swept over the valley while our party were ascending it, and soon filled the bottom of the gorge with a roaring and foaming torrent, which came down from the mountains and swept on toward the sea with a thundering sound. At length the party reached the brow of the table land, three thousand feet above the level of the sea, and came out under the walls of the town.

The town proved to be a dreary and comfortless collection of rude stone houses, without windows or chimneys, and blackened within with smoke. The inhabitants were squalid and miserable. Three-fourths of the people were nominally Christian. The visit of the Americans of course excited great interest. We have not time to detail the various adventures which the party met with in their intercourse with the inhabitants, or to describe the singular characters which they encountered and the extraordinary scenes through which they passed. They remained one night at Kerak, and then after experiencing considerable difficulty in escaping the importunities with which they were besieged by the chieftains for presents, they succeeded in getting away and in returning safely to their boat on the shore.

Our party, after having spent about three weeks in making these and similar excursions from their various encampments, during which time they had thoroughly explored the shores on every side, and sounded the depths of the water in every part, made all the necessary measurements and observations both mathematical and meteorological, collected specimens for fully illustrating the geology and natural history of the region, and carefully noted all the physical phenomena which they had observed, found that their work was done. At least all was done which could be accomplished at the sea itself. One thing only remained to be determined, and that was the measure of the depression of the sea. This could be positively and precisely ascertained only by the process of "leveling a line," as it is termed, across from the sea to the shores of the Mediterranean. This work they now prepared to undertake, making arrangements at the same time for taking their final leave of the dismal lake which they had been so long exploring.

It had been long supposed that the Dead Sea lay below the general level of the waters of the earth's surface, and various modes had been adopted for ascertaining the amount of the depression. The first attempt was made by two English philosophers in 1837. The method by which they attempted to measure the depression was by means of the boiling point of water. Water requires a greater or a less amount of heat to boil it according to the degree of pressure which it sustains upon its surface from the atmosphere – boiling with less heat on the tops of mountains where the air is rare, and requiring greater in the bottoms of mines, where the density and weight of the atmosphere is increased in proportion to the depth. Heights and depths, therefore, may be approximately measured by an observation of the degree of heat indicated by the thermometer in the locality in question, when water begins to boil. By this test the English philosophers found the depression of the Dead Sea to be five hundred feet.

A short time after this experiment was performed a very careful observation was made by means of a barometer, which also, measuring, as it does, the density of the air, directly, may be made use of to ascertain heights and depths. It is, in fact, often thus employed to measure the heights of mountains. The result of observations with the barometer gave a depression to the surface of the sea of about six hundred feet.

A third method is by trigonometrical calculation. This mode is much more laborious and difficult than either of the other modes which we have alluded to, but it is more to be relied upon in its results. The data for a trigonometrical calculation are to be obtained by observing, in a very accurate manner, a series of angles of elevation and depression on a line between the points, the relative levels of which are to be obtained. Lieutenant Symonds, an officer of the English service, made such a survey with great care, a few years after the preceding experiments were performed. He carried a line across from the Mediterranean to the Dead Sea, connecting the two extremes of it by means of a series of vertical angles which he measured accurately, with instruments of the most exact construction. The result of the computation which he made from these data, was that the sea was depressed one thousand three hundred and twelve feet below the level of the Mediterranean.

The surprise which had been felt at the results of the experiments first mentioned, was greatly increased by the announcement of this result. No one was disposed really to question the accuracy of the engineer's measurements and calculations, but it seemed still almost incredible that a valley lying so near the open sea could be sunken so low beneath its level. There was one remaining mode of determining the question, and that was by carrying an actual level across the land, by means of leveling instruments, such as are used in the construction of railroads and canals. This would be, of course, a very laborious work, but there was a general desire among all who took an interest in the subject that it should be performed and Lieutenant Lynch determined to undertake it.