Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Franklin ya lura da ka'idar sanyaya ta hanyar lura cewa a rana mai zafi sosai, ya kasance mai sanyaya a cikin rigar rigar rigar a cikin iska fiye da yadda ya yi a cikin bushe. Don fahimtar wannan lamarin a fili Franklin ya gudanar da gwaje-gwaje. A shekara ta 1758 a wata rana mai ɗumi a Cambridge, Ingila, Franklin da abokinsa masanin kimiyya John Hadley sun yi gwaji ta wajen yin amfani da ether a cikin wani ma'aunin zafin jiki da ake amfani da shi da kuma yin amfani da wani abu da ake kira bellows don a fitar da ether. Tare da kowane tururi mai zuwa, ma'aunin zafi da sanyio ya karanta ƙananan zafin jiki, a ƙarshe ya kai 7 ° F (-14 ° C). Wani ma'aunin zafi ya nuna cewa zafin jiki na ɗaki ya kasance a 65 ° F (18 ° C). A cikin wasikarsa Cooling by Evaporation, Franklin ya lura cewa, "Wani na iya ganin yiwuwar daskarewa mutum har ya mutu a ranar zafi".  Tambaya: A wace shekara ce masanin kimiyya John Hadley yayi gwaji tare da yin amfani da kwalliyar kwalliya tare da thermometers na mercury?
1758 da kuma