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समान अनुप्रस्थ काट की दो छड़े एक-दूसरे से सटाकर रखी गयी है जिनकी लम्बाइयाँ क्रमश: `l_(1)" तथा "l_(2)` तथा ऊष्मा चालकताएँ `K_(1)" व "K_(2)` है | सिद्ध कीजिये कि स्थायी अवस्था में छड़ो के सिरों के तापान्तर का अनुपात `K_(2)l_(1): K_(1)l_(2)` होगा |

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`(Q)/(t)=(K_(1)A(theta_(1)-theta))/(l_(1))=(K_(2)A(theta-theta_(2)))/(l_(2))" अतः "((theta_(1)-theta))/((theta-theta_(2)))=(K_(2)l_(1))/(K_(1)l_(2))`

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