1937

The Magma Copper Mine AC system designed by the Carrier Corporation was the first underground mechanical air conditioning system in North America. The initial installation of refrigerated cooling equipment in the Magma Mine at Superior, Arizona was necessary due to the increase in temperature lower into the mine. Below the 2000-foot level, the increase in rock temperature is approximately 1½ degrees F. per 100 feet of depth. The rock temperature on the 2000-foot level is 109°. 

In the 1930's thousands of acres of land were rendered unproductive through wind erosion because of drought, tillage, and dust mulch farming practices. Charles S. Noble, of Nobleford, Alberta, invented a cultivator that sheared stubble and weeds below the ground surface, leaving residue on the soil to reduce evaporation and prevent erosion by strong Alberta winds. The Noble Blade Cultivator was patented in 1937. The Noble family subsequently developed a variety of straight and V-blade cultivators.

This machine is the world's first successful automatic pickup, self-tying hay baler. Its invention was a significant contribution to the development of American Agriculture. The baler was invented and hand-built in 1937 at Farmersville, Pa., a few miles from here. After testing and improvement, some production models were made at Kinzers, Pa. Balers of this type were first mass-produced in 1940 by the New Holland Machine Company. Dedicated by American Society of Agricultural Engineers 1976

Prior to its merger with the Carnegie Institute of Technology in 1967 to form Carnegie Mellon University, the nonprofit Mellon Institute for Industrial Research was a major, independent research corporation dedicated to promoting applied research for industry and educating scientific researchers for the benefit of society as a whole. The Institute educated hundreds of fellows for careers in industrial research and helped to sell the very idea of research to manufacturers.

Put in service in 1937, this world-renowned bridge, conceived by Joseph Strauss and designed largely by Charles Ellis, was the longest single span (4,200 feet) in the world for a quarter century.

As with many civil engineering projects in their conceptual stages, naysayers scoffed at the Golden Gate Bridge. They said it would be technically unfeasible or too expensive to bridge the Golden Gate, a 1.7-mile-wide opening separating the Pacific Ocean from the San Francisco Bay. They said that the channel was too deep; the tides and winds too strong; the span too long.