Switching with the mercury-wetted-contact relay

The true essence of worth in any component (electrical, mechanical or solid state) can be illustrated by the length of time the particular device has been in use. Although the passage of time sees the introduction of many new devices, in the main, industry will continue to use components of proven reliability in many applications unless the new product demonstrates clearly its superiority in a number of spheres¿cost, reliability, size, availability etc.