Adam's version ensured that the distance between the Flamsteed glass and horizon vane was the same as the distance from the vane to the sight vane.
2.
He then moves the sight vane so that he observes the horizon in a line from the sight vane through the horizon vane's slit while simultaneously maintaining the position of the shadow.
3.
He then moves the sight vane so that he observes the horizon in a line from the sight vane through the horizon vane's slit while simultaneously maintaining the position of the shadow.
4.
With such a quadrant, the observer viewed the horizon from a " sight vane " ( C in the figure on the right ) through a slit in the " horizon vane " ( B ).
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