Press apparatus and methods of controlling same

A method of controlling a press apparatus suitable for pressurising a capsule to at least one gigapascal, the press apparatus comprises a frame suitable for accommodating the capsule and at least four load devices, each securable in relation to the frame and capable of applying variable load onto the capsule by urging a respective anvil against the capsule in response to control of a first or second operating parameter; measurement mechanisms for measuring the values of first and second operating parameters in respect of each of the load devices; and a control mechanism for controlling each load device; the method including: controlling a first of the load devices according to a set point of the first operating parameter; measuring the second operating parameter in respect of the first load device; and controlling a second of the load devices according to the measured second operating parameter in respect of the first load device. A method of controlling a press in which each load device can urge its respective anvil to move in response to a first and second displacement method; and a press suitable for pressurising a capsule to at least one gigapascal are also disclosed.