In 1858, in the course of some dredging operations for the purpose of deepening the mouth of the Limmat, fragments of pottery, bits of piles, and some peculiar beams having one or two square-cut holes ([Fig. 2], Nos. 13 and 14) were dredged up. Dr. Keller recognised here the site of a Pfahlbau which extended both under the little island called Bauschanze and outwards towards the lake. (B. 22 and 336.)
Two other localities near the outlet known as the "Kleiner Hafner" and "Grosser Hafner" were also proved to have been stations. The former was opposite the north end of the Tonhalle, and about 150 yards distant from the original shore. It occupied a circular area of about 1½ acre in extent and, when the water was low, its surface was only some 3 feet submerged. The Grosser Hafner was farther off in the lake, and its area was considerably larger than that of the Kleiner Hafner. On a clear day in both these localities stones and the tops of piles could be seen. Another locality known to Dr. Keller at this early period was about two miles from Zürich, on the west shore of the lake and just opposite the steamboat pier at Wollishofen. Here the lake-bed consisted of a deposit of fine mud, and owing to the constant commotion made by the steamers in passing to and fro the débris of the lake-dwelling had been greatly covered up. (B. 336.)
As the Kleiner Hafner lay directly along the course followed by the steamers, and greatly obstructed their passage, the authorities, in 1867, resolved to have the obstruction removed altogether. For this purpose a dredging machine was used, by means of which a segment several feet thick was removed from its surface. During this operation the same kind of perforated beams which had already attracted attention at the Bauschanze were turned up among the stuff, together with numerous objects of flint, stone, bone, etc., similar to those at Ober-Meilen ([Fig. 2], Nos. 9 to 17). In addition to these, however, there were bronze axes of the winged type, some spoon-shaped crucibles, large clay rings and fragments of pottery of an unusually fine kind ([Fig. 2], Nos. 1 to 8). But, what was considered still more strange, there were among these relics some iron weapons and Roman tiles.
Hitherto there was little or nothing done to the Grosser Hafner, and the "Haumessergrund" at Wollishofen, and so the surmises of Dr. Keller regarding them might have died with him, had it not been for the extraordinary exertions of the people of Zürich to have their beautiful environments made still more attractive by art. These extensive alterations, begun some six years ago, and scarcely yet completed, have so entirely changed the aspect of the shore in the immediate neighbourhood of the outlet, that visitors whose recollection of the town dates farther back than these transformations, will hardly recognise the locality. A splendid bridge now spans the opening of the Limmat, and on both sides of it are elegant promenades, gardens, and ornamental quays, which occupy what was formerly part of the lake. The filling up of such a great area of lake-bottom involved the use of dredgers, which, with revolving buckets, raised stuff from the most convenient shallows along the shore, and having dropped it into boats, it was then transported to its final destination. Among the localities selected for these operations were the Grosser Hafner and the outskirts of the Bauschanze. The rich loamy deposits of the Haumessergrund at Wollishofen were also found suitable for mixing with the gravel and for forming a good soil for the floral and horticultural gardens which now form such a conspicuous ornament to the fashionable walks along the northern shore of the lake.
Fig. 2.—Bauschanze (13, 14, and 21 to 23); Kleiner Hafner (1 to 12, and 15 to 17), and Grosser Hafner. All 1⁄3 real size except 13 and 14.
The Grosser Hafner[1] supplied a wonderful medley of antiquarian objects, apparently of all ages—stone hatchets (one of which was 10 inches long), horn handles, bone implements, etc. Among bronze objects were: hatchets of the winged type, chisels, sickles, knives some ornamented with half-circles, points, and lines ([Fig. 2], Nos. 30 and 35); pins with large heads, oval or round, and sometimes perforated and variously ornamented (Nos. 24, 25, and 26); arm-rings, both closed and open, and ornamented with engraved lines, dots, etc. (Nos. 18 and 28); a few spirals (No. 34), small rings and pendants (Nos. 19 and 27); two solid rings attached by a band (No. 29); a group of four rings—one being larger, on which the other three were hung (No. 20); a pin-like object, 15½ inches long, with a handle like that of a sword (No. 32); lance-heads, some of which were ornamented; a few small beads of amber. Among the fragments of pottery were two vessels complete with round bases (No. 31), and part of a moon-shaped crescent, rudely ornamented with depressions like finger-marks.