Each district elected two senators (plurality-at-large): The first-placer was to serve a six-year term while the second-placer was to serve a three-year term. On each election thereafter, one seat per district was up (first past the post). The senators from the 12th district were appointed by the American governor-general for no fixed term.
In each electoral area, two senators were elected: The top performer received a six-year mandate, while the runner-up secured a three-year term. Subsequent elections saw one seat per district up for grabs (first past the post). The 12th district's senators were appointed by the American governor-general without a set duration.