Crucible

摘要

A resistance heating crucible for use in holding a sample to be fused by a furnace includes a cylindrical side wall communicating with a bottom floor having an exterior button-like projection extending centrally therefrom to define an annular contact surface surrounding the button-like projection for seating with the crucible-activating electrode associated with the furnace. The circular bottom is chamfered along the junction of the bottom with the cylindrical side wall to reduce and limit the annular contact surface. the interior floor of the crucible is rounded to reduce the cross section through the bottom and in cooperation with the chamfered edge, increases the heating effect of current passing through the bottom of the crucible.