Ford has beaten General Motors for the first time in nearly a century, in terms of number of US factory workers. Ford has 50,703 to GM's 50,300 or so.
Answers. Well, the simplest answer is that the astrolabe pretty well had to be used at night and could not be used in bad weather. The compass, which relys on the magnetic field of the Earth rather than a visualiztion of the stars, works at any time, and in any weather.
Another limitation of hand held dynamometry is that the tester has to be stronger than the patient to hold the dynamometer stationary . This can be particularly problematic for the evaluation of plantar flexors in adults and in adolescents for whom torque can easily reach values that the evaluator can have difficulties counteracting .