It is clear and understood that industry uses wheels and castors widely both in manufacturing and transport. The number of polyurethane tyred castors in both fixed and braked swivel is enormous throughout all countries. The motor vehicle industry of course runs on inflatable rubber tyred wheels and the need for replacement wheels throughout industry will be for ever – or at least while we have industry. Industry still generates a large share of our exports and keeps the balance of payment surfeit almost within sight. But there are other sources of activity, which use wheels and castors and are important to our national finance.
The theatre generates a good deal of income and produces more wealth than it absorbs. All theatres have stage managers and all plays have producers and directors. New sets are being designed constantly and use all manner of wheels and castors to keep things on the move. Each scene shift utilises, low slung trolleys having 4 castors, usually a back 2 of fixed castors and a front 2 of braked swivel castors to enable steering and stillness while loading and unloading. They also use ball bearing castors set into the body of a trolley or item, capable of 360° manoeuvrability. You might imagine the various scene shifts in Shakespeare’s plays, which, as in Henry V, moves by the use of wheels and castors from England to France and the battle of Agincourt. The great theatre at Stratford has its own large workshops and uses rubber tyred wheels and polyurethane tyres and castors, as well as jacking castors in some quantity. Sad to think that Shakespeare never knew a pneumatic tyre and didn’t know how to mend a puncture.