Shed 21 was a wool store and dump (a descriptive term for the place/facility where wool which had arrived in bales from farms at a modest density was re-packed to minimise shipping volume).
Most sheep farms had screw presses to squeeze the wool into tight bales, but the density was capable of being increased at least twice and often three times by pressing two or three bales together in a facility which had hydraulic machinery. These facilities were located at just a few export ports around New Zealand and Wellington was the collection and export point for nearly all the wool that was grown in the North Island from The Manawatu and The Wairarapa.
The building had travelling gantry cranes and was fully open to the roof (a three story high space) It is now in three floors and partitioned as apartments.
The faceted tower held one of the two hydraulic accumulators on the Harbour Board network. It is clear from what remains that the weights that were driven up by the hydraulic pumps went (traversed) the full three floors and that they (or it) filled the whole void of the tower, the guide rails are on opposite faces and wear on the guides extends to nearly floor level. The implication may be therefore that the hydraulic cylinder was sunk entirely below floor level (3 stories down) and that it may still be in place under the new concrete floor of the tower which has been converted to a stair well.
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Photo taken in Pipitea, Wellington, New Zealand
Misplaced? Suggest new location