Shock Collar Question of the Day (11/11/22)

On this day in 1878, Emma Nutt became the first woman ever to be hired in her field of work. Previously, only men had been chosen for this particular job, but because of their lack of patience and bad behaviors like cursing or practical jokes, this business decided that women would be much more suitable for it. To be hired, a lady must meet these requirements...She had to be unmarried, between the ages of 17 and 26, and have long arms. Emma fit that criteria and became a pioneer in her field, what job was it?