Does anyone know the purpose of the small 'lookout' windows on the top of number 3 slip please, (see attached picture)? The space is reached by a series of wooden stairs from ground level and presumably was too distant to be an overseers office. The space looks out in a north easterly direction over what would have been the mast ponds and possibly as far as the basins on St Marys island. There may possibly have been more of these spaces, the angles on the structure roof would allow it, but there seems to be no obvious evidence of additional ones being provided.