[GreenKeys] Mercury Relays

[Craig Sawyers]

>    Mercury-wetter relays
>    8 Ea.
>    SPDT
>    110 VAC coil
>    Mfr: C. P. Clare & Co., of Chicago
>    Octal (tube-type) base
>    Model:  HSG 1009
>    Marked "high speed"

Just to give an idea of what "high speed" might mean, the Tektronix 109
pulse generator uses a mercury wetted relay to give a pulse with 250ps (IOW
a quarter nanosecond) rise time.  In the 519 oscillopscope, a reed is used
to produce a calibration pulse with 100ps rise time.  To put this in
perspective: in 100ps light travels around one inch.

Craig