This page is intended to support a lecture given by Graham Dolan to the Flamsteed Society at Greenwich.
Those marked * were in use at the time the Power Station was being built.
The following description is taken from a series of articles Maunder wrote about the Observatory in 1897/8 for The Leisure Hour. Click here to read them in full.‘The transit circle, on the other hand, is equally supported on both sides. This, however, does not free it from the liability to some, minute flexure in the direction of its length, from the weight of its two ends. The type of observation used to detect any such bending is a little more complicated and exciting than that already described. In this the observer makes use of a large shallow dish containing mercury, and, instead of pointing his telescope up to the star, points it down towards the mercury, and observes, not the star itself, but its image as reflected from the surface of the liquid. He sets the telescope carefully before ever the star comes into the field of view, and reads his seven microscopes. Then he climbs up a narrow wooden staircase and watches the star transit nearly half across the field. Then comes a rush, the observer swings himself down the ladder, unclamps the telescope, turns it rapidly up to the star itself, clamps it again, flings himself on his back on a bench below the telescope, and does it so quickly that he is able to observe the star across the second half of the field. There is no time for dawdling, no room for making any mistakes; the stars never forgive; “they haste not, they rest not"; and if the unfortunate observer is too slow, or makes some slip in his second setting, the star, cold and inexorable, takes no pity, and moves regardless on.’
* From the LCC Photograph Library (London Metropolitan Archives)
** Ballast Quay website