I Return you many thanks for the great trouble you have taken in procuring Mr. Dollond’s telescope for me; which, happening to arrive very opportunely the day before the observation, gave great pleasure to our Serene Elector: a very happy invention which England alone was capable of producing! but at it's coming to my hands I had no small concern, for fear all our apparatus should be rendered vain, as it was constant rainy weather.

A square mount of solid stone which had been made into an arch, in the Electoral garden at Schwesinga by his Highness’s order, afforded us a basis; in the middle of which another mount of like form was raised five feet high, which supported the astronomical quadrant: both were covered with a moveable covering, the building being carried round them.

Two other small buildings of the same construction stood near this; in one of which Mr. Dollond’s tellescope was placed, and in the other the clock; having so easy a communication with one another, that a glance of the eye commanded them all.

The astronomical quadrant, which was a 1/2 feet radius Paris measure, was made in the year 1758, at Paris by M. Carinivet mechanical operator to the