 Complete the following phrase:  Bird supplied the astronomer James Bradley with further instruments of such quality that the commissioners of longitude paid him 500 a huge sum on condition that he take on an apprentice for 7 years and produce in writing upon oath, a full account of his working methods. This was the origin of Birds two treatises The Method of Dividing Mathematical Instruments 1767 and The Method of Constructing Mural Quadrants 1768. Both had a foreword from the astronomer-royal Nevil Maskelyne. When the Houses of Parliament 