Observations made for determining the geographical position of the magnetic observatory at Hobart Town, Van Diemens Land

In connection with the trigonometrical survey now in course of operation in this island, I have considered that a correct knowledge of the geographical position of the observatory might be interesting to this society, from its being the only spot in the colony where such a series of careful observations are likely to be carried on, (at least for some time to come), as are necessary to determine a geographical position with exactness.