Article on factory workers in the 1800s

Many workers in the late 1800s and early 1900s spent an entire day tending a machine in a large, crowded, noisy room. Others worked in coal mines, steel mills, railroads, slaughterhouses, and in other dangerous occupations. Most were not paid well, and the typical workday was 12 hours or more, six days per week.

Explanation:

the answer is longitudinal model