Abstract: A prescription lens insert and methods of use are described, in which flexing a frame of a prescription lens insert, such that left and right rims of the frame are displaced mediolaterally, aligns respective larger ends of two keyhole apertures of the frame with left and right mushroom-shaped connector pegs protruding rearward from a pair of protective glasses. The prescription lens insert is then placed over the left and right connector pegs, such that distal heads of the connector pegs pass through the two keyhole apertures of the frame and the keyhole apertures are disposed adjacent shaft portions of the connector pegs. The frame of the prescription lens insert is then unflexed to align respective smaller ends of the two keyhole apertures with the left and right connector pegs, such that the distal heads prevent removal of the unflexed frame.

Abstract: A method of operating a flotation cell wherein a feed stream containing particles is provided to the flotation cell wherein a proportion of the particles rise in the cell and exit the cell in a concentrate stream and a proportion of the particles sink in the cell, wherein at least a portion of the particles that sink in the cell are subject to a classification process to produce classified particles and at least a portion of the classified particles are recycled to the flotation cell.

Abstract: A pumpbox, the pumpbox being in fluid communication with one or more vessels, wherein the pumpbox comprises a classification portion and level control means adapted to control the level of fluid within the one or more vessels.

Abstract: A method of operating a flotation cell wherein a feed stream containing particles is provided to the flotation cell wherein a proportion of the particles rise in the cell and exit the cell in a concentrate stream and a proportion of the particles sink in the cell, wherein at least a portion of the particles that sink in the cell are subject to a classification process to produce classified particles and at least a portion of the classified particles are recycled to the flotation cell.

Abstract: A pumpbox, the pumpbox being in fluid communication with one or more vessels, wherein the pumpbox comprises a classification portion and level control means adapted to control the level of fluid within the one or more vessels.

Abstract: An oil sands flotation circuit wherein a feed stream is fed to a bank comprising at least one rougher flotation cell producing a rougher concentrate stream and a rougher tailings stream, said rougher concentrate stream being fed to a bank comprising at least one cleaner flotation cell producing a cleaner concentrate stream and a cleaner tailings stream.

Abstract: A flotation method in which a liquid or slurry is fed to a downcomer (20) where it forms a region of high void fraction which moves out of the downcomer (20) into a vessel (10) in which a froth rises and liquid or slurry falls, characterized in that the liquid or slurry is fed to the downcomer (20) with a jet velocity as it exits an orifice and enters a free jet zone of less than 8 metres/second.

Abstract: A remote mounted RF (radio frequency) bi-directional converter/amplifier device that connects to a half-duplex radio transceiver that converts and amplifies the RF signals to and from that signal to a different radio band. The pole mounted converter senses when the transceiver connected to it goes into the transmit mode and automatically switches the device from converting the received signal to the RF band of the transceiver to converting the RF signal from the transceiver to a different frequency band and amplifying that transmit signal. Refer to FIG. 1. This invention is an improvement to and continuation of the amplifier system that is disclosed in Utility patent application Ser. No. 09/505,201 filed Feb. 16, 2000.