Contact Makers of Delicate Action

Abstract

I HAVE allowed an error to creep into the sectional elevation of the contact-maker described in your last issue. The bent wire merely dips into the capsule at D, and is separate from the wire, which passes up the tube. This latter wire merely forms part of the circuit, being connected with the terminal as shown in the plan. It should be noted that the plug K is only inserted when the contact-maker is being moved about. Except when this is the case, the mercury passes freely through the opening at M, and nothing but the friction of mercury resists the motion of the wire.