Botany
A grey metal case containing a clock-driven rotating drum in an enclosed chamber. In an adjacent section there is a bi-metal strip for measuring temperature and a (horse?) hair bundle for measuring humidity. Each substance actuates a separate recording arm that records temperature and humidity data, respectively, onto a chart [Read More...]
TH=his is a grey metal case containing a clock-driven rotating drum in an enclosed chamber. In an adjacent section there is a bi-metal strip for measuring temperature and a (horse?) hair bundle for measuring humidity. Each substance actuates a separate recording arm that records temperature and humidity data, respectively, onto [Read More...]