[Varley]

Anything to oblige Chief.

A rolling stone is a fortuitously shaped piece of rock that is used for the making of pastry and for a myriad of other galley uses. If left unused for any length of time in a damp place (difficult to avoid here) they can become host to solarphilic microbial and vegetable growth (much like a shower curtain).

I understand that a well known skiffle band chose its name because their rolling stone gathered a crop that gave off a soothing aroma when accidentally set afire.

It is believed that Dr. Rudolph was attempting to design an oil burning machine to artificially shape raw rock into the cylindrical ideal but ended up with a contraption that was overly prone to crushing the feedstock instead. Attempts to perfect the late doctor's invention continue to this day but environmental heath concerns limit these experiments to seaborne platforms.