This radiometer comprises a partly evacuated glass bulb about 70mm in Diameter mounted on a round base, containing at its centre a fine pivot which supports four light weight metal arms. One side of each vane is blackened , the reverse side is bright. When the light strikes the wings, it transfers the heat to each one, but not at the same degree.
This neoprene hose connects your bunsen, tirrill or any other type of burner to a fuel source. Connect your burner to a fuel source. 3 feet (.9m) in length.