Abstract: A solar tile assembly having a removable outer panel (1) that includes a number of photovoltaic cells (3) disposed on an outermost surface thereof, and an inner support structure (2). The photovoltaic cells cover a lower portion of the outer panel. The outer panel is secured to the inner support structure using fasteners disposed at a front end of the solar tile assembly. The inner support structure includes a framework having a lower stepped interlockable section. In use the interlockable section is disposed under a portion of an adjacent tile assembly. The removable outer panel is provided with electrical connectors (19a) in the underside thereof, which electrical connectors form an electrical connection with connectors (13) provided on the inner support structure when the outer panel is slid towards the inner support structure.

Abstract: To enable a spectrometer (10) to be used for taking analysis readings from plastics articles (24) of varying shapes and degree of preparation, the spectrometer (10) is enclosed within a housing which has an interface device (14) attached to the sensing window (58). The interface device (14) is sensitive to the positioning of a sample (24) in position to carry out sample preparation tasks as the sample is brought into the analysis position opposite the sensing window (58). The interface device (14) comprises a front wall (16) with a sample aperture (18) against which the sample (24) can be placed so that a surface of the sample (24) is exposed through the aperture (18), means (48) for cleaning a sample surface (24) placed against the front wall (16), means (52) for extracting debris resulting from the sample cleaning, and means (30, 32) for guiding the front wall (16) towards the sensing window (58) to enable the spectrometer (10) to take a reading from the sample surface (24).