may be a metallic wire having a diameter ranging from 0 1 to 0 3 min the lead wire may be made of a precious metal such as platinum or rhodium alternatively the lead wire may include a main wire consisting essentially of for example stainless steel or an iron nickel alloy and a layer coated onto the radial surfaces of the main wire the layer may be made of a precious metal for example platinum and an alloy including platinum a paste fixes the lead wire to the substrate the paste is preferably electrically conductive and the paste may include glass and metallic particles for example platinum dispersed therein the paste forms a connection that connects the lead wire to the substrate the connection electrically connects the lead wire to the film alternatively the paste may not necessarily be electrically conductive in this embodiment an electrically conductive layer may be formed onto a surface of the connection so as to electrically connect lead wires to the metallic film through the electrically conductive layer the electrically conductive layer may be made by forming a paste a method of coating the glass layer may include the steps of making a slurry including glass powder putting the slurry onto the surfaces of the metallic resistor and connections.