Abstract: The present invention provides a batten mount 51 for attaching to a first batten 1, and an elongate member 53 having a tile-securing part 55 and a fulcrum contact for engaging with a second batten 2, where the batten mount 51 is selectively attachable to the elongate member 53 at either: a first position spaced from the first end by a first distance; or a second position spaced from the first end by a second distance different from the first distance. In this way, the distance between the fulcrum contact and the point at which the elongate member is attached to the batten mount can be selected to correspond to the gauge of the roof, thereby making the roof tile attachment system appropriate for use on a number of different roofs having different gauges.

Abstract: Photovoltaic roof tiles are provided with interlocking edges; however, these can be expensive to manufacture and time-consuming to install. A more cost-effective option of tiling may use a double-lap tile arrangement. Because plain tiles have no interlocking edges, water can leak through the joins between tiles. This requires a third tile to be placed below the join to catch any water passing through. With double-lap tiles, a significant part of each tile remains covered after installation, such that a relatively small surface area is in view of the sun. Photovoltaic roof tile 302 is useable with double-lap tiles 301, the photovoltaic roof tile 302 having a tile width equal to an integral multiple of the double-lap tile width. In this way, such photovoltaic roof tiles 302 may be arranged with conventional double-lap roof tiles 301 to increase the proportion thereof available to sunlight 305, 307, without risking ingress of water.

Abstract: Photovoltaic roof tiles are provided with interlocking edges; however, these can be expensive to manufacture and time-consuming to install. A more cost-effective option of tiling may use a double-lap tile arrangement. Because plain tiles have no interlocking edges, water can leak through the joins between tiles. This requires a third tile to be placed below the join to catch any water passing through. With double-lap tiles, a significant part of each tile remains covered after installation, such that a relatively small surface area is in view of the sun. Photovoltaic roof tile 302 is useable with double-lap tiles 301, the photovoltaic roof tile 302 having a tile width equal to an integral multiple of the double-lap tile width. In this way, such photovoltaic roof tiles 302 may be arranged with conventional double-lap roof tiles 301 to increase the proportion thereof available to sunlight 305, 307, without risking ingress of water.

Abstract: A rotary fluid machine has an inner rotor and an outer shell held by a stationary support structure, arranged so that sealing points on the inside of the shell interact in a sealing arrangement with the outer surface of the rotor to define working chambers, such that in use the relative motion of the rotor to the shell causes fluid to be moved through ducts in the rotor and rotor shaft, between the working chambers and a point where the rotor shaft interacts with the support structure.

Abstract: A rotary fluid machine has an inner rotor and an outer shell held by a stationary support structure, arranged so that sealing points on the inside of the shell interact in a sealing arrangement with the outer surface of the rotor to define working chambers, such that in use the relative motion of the rotor to the shell causes fluid to be moved through ducts in the rotor and rotor shaft, between the working chambers and a point where the rotor shaft interacts with the support structure.

Abstract: An array of panels absorptive to solar radiation 21 is made up of individual panels 24, 25 etc. A duct runs along a panel 25 and terminates near the edge of the panel as a terminals 27. This terminal is positioned so that it shares a common axis with a second terminal on a second panel 24, whereby the terminals may be brought into close proximity and connected with a connector 26. This connection may be made by sliding one panel along the axis of its terminal towards a second panel.