For example , during the last half of the 19th century , many grist mills were built at Saint PERSON@1 , utilizing the 50-foot -LRB- NUMBER@1 m -RRB- drop in the LOCATION@1 .

For example , during the last half of the 19th century , many grist mills were built at LOCATION@2 , to use the NUMBER@2 foot -LRB- NUMBER@1 metre -RRB- drop in the LOCATION@1 .
