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In the new meth od an inva r t ape is heated by passing direct curren t through it while th e a mbient temperature is h eld con stant. Observat ions of chan ges in length and electri cal resistance a re taken at differen t con stant temperatures of t he t ape. The tempera t ure coe ffi cient of resistance of each tape is obtained experim entally or from a relationship , deri ved by t he a u thors, between te mperat ure coeffi cien ts of resist!1nce and mass resist ivi ties. The actual tempera t ures of t he tape a re determin ed from its different resistances a nd te mperature coeffi cien t of resistance. Coe ffi cient s of expa nsion determined by this meth od from 15° to 35° C a re in good agree men t wi t h t h ose obtain ed by th e method used prev iously at the Bureau . Wi th t he new method greate r precision is ob tain ed in a mu ch shor te r t im e t ha n with the old method, an d the observers are not sub jected to wid ely differen t a mbien t te mperatures.

A new method for determining linear thermal expansion of invar geodetic surveying tapes