There also were 88 cases of silicosis in that period, but silica exposure levels aboard ships were not accurately measured until the mid-1980's.

The intensity was not measured until 1791, after advances in the understanding of electromagnetism.

Popularity was never easily measured, until the advent of social-networking sites.

The time is measured until a thrombus (clot) forms.

"The real impact can't be measured until the mo- ment when you see it yourself," he said.

The study began in April 1975, and species richness was measured monthly on all three sizes of boulders, until May 1977.

This was not measured until a party just before him, by a Lieutenant Simpson.

This is called the Casimir Effect (first predicted in 1948, but not experimentally measured until 1997, due to the very small forces involved).

The subscapular skinfold thickness was not measured until 1978-1979 (the third examination of schoolchildren), and levels are shown only for adults.

American per-capita potato consumption had declined since 1910, and was not measured at previous levels until 1962, when french fries were a fast-food restaurant staple.