But the pilots, flying on rudimentary instruments, followed a course of 109 degrees - straight at the highest mountain for miles around.

Although Digges may have created a rudimentary instrument involving lenses and mirrors, the optical performance required to see the details of coins lying about in fields, or private activities seven miles away, was far beyond the technology of the time.

His biographer Judith Blezzard describes Goss as "a distinguished and painstaking teacher, and a tasteful and virtuoso performer on the organ, creating marvellous effects on the then comparatively rudimentary instrument."

Alessandra Belloni and Glen Velez are two virtuosos of a rudimentary instrument capable of astonishing subtlety: the frame drum, a family of instruments that includes the tambourine.

Kelly developed a routine, sweeping his eyes over the rudimentary instruments, playing little games, like trying to hold his craft exactly level without using the angle indicator-but that proved impossible.

Without those rudimentary yet extremely critical instruments, the ambitions of Columbus, along with his sponsoring state, would have been crushed.

At an early age, Johnson got his first rudimentary musical instrument, a diddley bow.

By eliminating conductivity from the variable set, Austin meticulous measurements with carefully calibrated but rudimentary instruments of the day, produced a clean set of data of field strength against frequency and distance.

The description seemed to suggest that Digges created a rudimentary instrument incorporating lenses and a concave mirror, in a manner rather different from a modern reflecting telescope.

The scientists who examined the data from the rather rudimentary instruments on board those two spacecraft pointed out that more missions with more up-to-date instrumentation would be necessary to resolve the question.