At the time , it is simply a tool for demonstrating some of the sunray 's nature (Horace , n .d . Moreover , Sir John Herschel , a noted astronomer , developed the hot box into a cooking device . On one of his expedition in the 1830 's , he uses a small mahogany container covered by glass , set into a wooden frame shield by another sheet of glass and by sand . He noted that the temperature inside the box were 240 ? F , well above the...











SUBJECTS

