When Googling "delay line memory" you will be directed to places such as the Computer History Museum to see examples of delay lines using the technology of the 1940's. At that time SRAM was implemented with devices such as latching relays or electronic FF using vacuum tubes, whereas using modern technology SRAM is implemented with electronic FF using large scale integrated circuits. A modern version of the mercury column for conducting sound pulses would be an integrated circuit shift register or its analog equivalent, the CCD.
It would be neat to contrast the concept of delay line memory with static RAM in terms of the technology available back then (way before my time) versus now. Realize that there were good reasons why delay line memory was used in the first generation electronic computers.
