Abstract: A method of operating a charged-particle microscope, the method comprising: recording a first image of a first region of an object in a first setting; recording a second image of a second region of the object using the charged-particle microscope in a second setting; reading a third image of a third region using the charged-particle microscope, wherein the first and second regions are contained at least partially within the third region; displaying a representation of the first image at least partly within the displayed third image, wherein the representation of the first image includes a first indicator which is indicative of the first setting; displaying a representation of the second image at least partly within the displayed third image, wherein the representation of the second image includes a second indicator which is indicative of the second setting, and wherein the displayed second indicator is different from the displayed first indicator.

Abstract: A method of operating a charged-particle microscope, the method comprising: recording a first image of a first region of an object in a first setting; recording a second image of a second region of the object using the charged-particle microscope in a second setting; reading a third image of a third region using the charged-particle microscope, wherein the first and second regions are contained at least partially within the third region; displaying a representation of the first image at least partly within the displayed third image, wherein the representation of the first image includes a first indicator which is indicative of the first setting; displaying a representation of the second image at least partly within the displayed third image, wherein the representation of the second image includes a second indicator which is indicative of the second setting, and wherein the displayed second indicator is different from the displayed first indicator.

Abstract: A multifilament sheet, tow or web of acrylonitrile precursor fibres are passed through a pre-heat zone at a temperature at least 100.degree. C below the critical temperature. The material is then passed through a two-stage oxygenation zone comprising a first stage at 220.degree. to 250.degree. C and a second stage at 260.degree. to 300.degree. C. The material passes straight through the oxygenation zone and is held in sufficient uniform tension to stretch the fibres during heating and oxygenation. The oxygenated material is then passed through a carbonizing zone comprising at least one stage at 1050.degree. to 1600.degree. C under non-oxidizing conditions. The resulting carbon fibre has a mean Young's modulus of at least 25 .times. 10.sup.6 p.s.i. and a mean tensile strength of at least 250,000 p.s.i.