During the time London was being rebuilt after the great fire of 1666 a great deal of research went on in connection with building construction and the strength of materials.
Robert Hooke, who was Chief Surveyor to the City of London, took a leading part in this work and extended his researches to include an investigation of elasticity in general. He investigatedL the relationship between the deformation of a material and the force applied to iUlf the deformation of a material is proportional to the force applied, then the material is said to obey Hooke’s Law) Hooke illustrated the law by reference to four different experiments:
(I)Loading a wire (deformation = increase in length).
(2) Loading a spiral spring (deformation = increase in length), see page 40.
(3) Loading a horizontal beam fixed at one end (deformation = depression of the free end)
(4) Tightening a watch spring (deformation = angular rotation).