the professors received £50 a year. the terms of their position were very precise, for example: :"the geometrician is to read as followeth, every trinity term arithmetique, in michaelmas and hilary terms theoretical geometry, in easter term practical geometry. the astronomy reader is to read in his solemn lectures, first the principles of the sphere, and the theory of the planets, and the use of the astrolabe and the staff, and other common instruments for the capacity of mariners."