. Electronic apparatus for biological research . (a) (b) (c) Figure Operation of ordinary relay on Mercury relays For very high currents mercury switches {Figure ) have many advan- tages over solid contacts. Thus with a tube about 1 in. long, 250 V 15 amps can safely be switched by a tilting movement of about 10 degrees. Various contact combinations—make, break, change-over and make-before-break— are available, and time-lags of up to three minutes can be arranged by using constricted tubes. While complete assemblies of relay mechanism and mercury switch are commercially availab
. Electronic apparatus for biological research . (a) (b) (c) Figure Operation of ordinary relay on Mercury relays For very high currents mercury switches {Figure ) have many advan- tages over solid contacts. Thus with a tube about 1 in. long, 250 V 15 amps can safely be switched by a tilting movement of about 10 degrees. Various contact combinations—make, break, change-over and make-before-break— are available, and time-lags of up to three minutes can be arranged by using constricted tubes. While complete assemblies of relay mechanism and mercury switch are commercially available, it is quite possible to mount a tube on a standard relay frame, such as the 3000 type. The mounting should be slightly resiUent 522
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