It's not clear if his new radiometer-anevacuated glass bulb with a very sensitive weather vane inside-actuallydetected Philip.

We make the-thing, in an evacuated glass tube, but as they are cheap, it is not an expensive procedure.

His interests, however, were varied, and he decided In 1860 to make an electric light using a carbon filament inside an evacuated glass chamber.

Named after its inventor, you know who, the Crookes tube consisted of an evacuated glass bulb with two metal plates inside at either end.