In 1934, the original engineers for the Lincoln Tunnel did not have much to choose from in terms of dewatering pumps. They had to rely upon a relatively new concept of a self-priming pump which had the ability to keep its suction flooded and lift water from a lower level into its pumping guts/ impeller. This smaller pump was used in an integral position to prime the larger pumps which kept water from flooding the tunnel. At that time, as my deceased friend Robert McCarton told me, a company called Fredericks supplied a horizontal split cased pump to keep the tunnel dry. The small self-priming pump played an important role as the water level rose; it was the first pump that would start and its main role was to fill the three larger mid-river disaster pumps ensuring that all the air was evacuated from their cavities ensuring that the pump would prime instantly when required to do so.