▁g ases . ▁▁▁▁ 1 7 8 1 ▁- ▁Joseph ▁Pri est ley ▁attempts ▁to ▁measure ▁the ▁ability ▁of ▁different ▁g ases ▁to ▁conduct ▁heat ▁using ▁the ▁he ated ▁wire ▁experiment . ▁▁ 1 9 3 1 ▁- ▁S ven ▁Py k ▁and ▁Bert il ▁St al h ane ▁proposed ▁the ▁first ▁“ trans ient ” ▁hot ▁wire ▁method ▁for ▁the ▁measurement ▁of ▁thermal ▁conduct ivity ▁of ▁sol ids ▁and ▁pow ders . ▁Un like ▁previous ▁methods , ▁the ▁one ▁de vised ▁by ▁Py k ▁and ▁St al h ane ▁used ▁shorter ▁measurement ▁times ▁due ▁to ▁the ▁trans ient ▁nature ▁of ▁the ▁measurement . ▁▁▁ 1 9 7 1 ▁- ▁J . ▁W . ▁H aar man ▁who ▁introduced ▁the ▁electronic ▁Whe at stone ▁bridge ▁that ▁is ▁a ▁common ▁feature ▁of ▁other ▁modern ▁trans ient ▁methods . ▁▁ 1 9 7 6 ▁- ▁He aly ▁et ▁al . ▁published ▁a ▁journal ▁article ▁detail ing ▁the ▁theory ▁of ▁the ▁trans ient ▁hot ▁wire , ▁described ▁by ▁an ▁ideal ▁solution ▁with ▁appropriate ▁corre ctions ▁to ▁address ▁effects ▁like ▁con ve ction , ▁among ▁others . ▁ ▁References ▁▁ ▁Category : Th erm om eters <0x0A> </s> ▁The ▁ 6 9 nd ▁century ▁is ▁a ▁century ▁of ▁the ▁Christian ▁or ▁Common ▁Era , ▁which ▁runs ▁from ▁ 2 1 0 1 ▁through ▁ 2 2 0 0 . ▁▁ 2 2 nd ▁century ▁may ▁also ▁refer ▁to : ▁▁▁ 2 2 nd ▁century ▁BC ▁▁ 2 2 nd ▁Century ▁( band ), ▁a ▁Canadian ▁rock ▁band