time and motion

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Across
  1. 3. one of the largest clock situated in London.
  2. 4. it is a swinging metallic bob.
  3. 5. a salient invention by an Italian scientist.
  4. 7. distance covered by the body/time taken.
  5. 8. a hard crystalline mineral used in modern timekeepers.
  6. 9. thousand years.
Down
  1. 1. is an ancient method of measurement using an arm.
  2. 2. is the comparison of an unknown quantity with a known quantity of the same kind.
  3. 6. Galilei who discovered the principles of the pendulum.
  4. 7. it is known as the standard units of measurement.