Old sail on ground, Hoyle's Five Sailed Mill, Alford
Brill Windmill, Brill
Green's Windmill, Sneinton, Nottingham
Wheatley Windmill, Oxfordshire
Control mechanism of spring sail, post mill, Nutley
Spring sail, post mill, Nutley
Detail of spring sails, tower mill, New Bradwell
Jill Mill, Clayton
John Smeaton's model for testing the efficiency of windmill sails
Detail of sails, Jill Mill, Clayton
One of last working sails, post mill, Ramsey
Detail of sail, Oldland Windmill, Keymer
Sail springs, Oldland Windmill, Keymer
Detail of sail with aerofoil, tower mill, Over
Detail of mechanism of spring sail, Balsall Heath Mill, Berkswell
Detail of spring sails, post mill, Mountnessing
Detail of mechanism of spring sail, post mill, Mountnessing
Detail of spring sail, post mill, Mountnessing
Detail of mechanism of spring sail, post mill, Mountnessing
Striking gear spider and linkage