Tuhia he haere tonu mo tenei whitianga - I whiwhi a Armsby i te mohiotanga whanui i te wa e ora ana ia. I whakawhiwhia ia ki nga tohu honore mai i te Whare Wananga o Wisconsin (1904), Whare Wananga o Yale (1920), me te Whare Wananga o Worcester Polytechnic (1921). I pootihia ia hei mema o te National Academy of Sciences, te Royal Society of Arts, me te Royal Swedish Academy of Agriculture and Forestry. I whakawhiwhia ki a ia he mētara koura i te Panama-Pacific International Exposition
i te tau 1915 mō tana tauira o te calorimeter i hangaia e ia ki Penn State. I kīia e tētahi pūrongo a te Tari Ahuwhenua o Amerika, ko ia "te kaiārahi matua o te rangahau i te mara o te kai kararehe i te whenua, ā, he mana ā-ao".