Tuesday May 8, 1894

M^r Crisp came down with M^r Grundy about warming Physical Obs^y by hot air.

William Christie, Astronomer Royal

RH says.... Some information about Mr Grundy and his company can be found here. The company (under John Grundy senior) filed a patent for heating rooms and buildings by hot air in 1864, a system that was adapted with improvements patented in 1889. This drawing is, I assume, from the original patent and may reflect what is still present in today's South Building at the ROG.