At the National Engineering Laboratory the performance of large pumps is being measured to an accuracy never before achieved on a test of this size. This has meant developing against the clock new techniques and instruments.

The pumps are only models - experimental designs for the big pumps that will drive water from north to south California over a mountain range. The need for accuracy is because the full-size pumps will consume so much electricity that even small increases in efficiency would lead to the saving of millions of pounds.
Presented by Dr. L. Grunberg and Dr. E.A. Spencer.