Abstract: An electro-optic display having a plurality of pixels is driven from a first image to a second image using a first drive scheme, and then from the second image to a third image using a second drive scheme different from the first drive scheme and having at least one impulse differential gray level having an impulse potential different from the corresponding gray level in the first drive scheme. Each pixel which is in an impulse differential gray level in the second image is driven from the second image to the third image using a modified version of the second drive scheme which reduces its impulse differential The subsequent transition from the third image to a fourth image is also conducted using the modified second drive scheme but after a limited number of transitions using the modified second drive scheme, all subsequent transitions are conducted using the unmodified second drive scheme.

Abstract: A feeder is disclosed for dissolving a chemical and mixing it with a liquid. The feeder includes a hopper adapted to hold the chemical, a nozzle located in the hopper, and a supply of the liquid to the nozzle to dissolve the chemical on contact with the liquid from the nozzle to form a solution. A solution basin is disposed under the hopper and a drain is provided from the hopper into the solution basin. An outlet from the solution basin has an outlet valve which opens when a solution level in the solution basin rises.

Abstract: A feeder is disclosed for dissolving a chemical and mixing it with a liquid. The feeder includes a hopper adapted to hold the chemical, a nozzle located in the hopper, and a supply of the liquid to the nozzle to dissolve the chemical on contact with the liquid from the nozzle to form a solution. A solution basin is disposed under the hopper and a drain is provided from the hopper into the solution basin. An outlet from the solution basin has an outlet valve which opens when a solution level in the solution basin rises.

Abstract: A feeder is disclosed for dissolving a chemical and mixing it with a liquid. The feeder includes a hopper adapted to hold the chemical, a nozzle located in the hopper, and a supply of the liquid to the nozzle to dissolve the chemical on contact with the liquid from the nozzle to form a solution. A solution basin is disposed under the hopper and a drain is provided from the hopper into the solution basin. An outlet from the solution basin has an outlet valve which opens when a solution level in the solution basin rises.

Abstract: A feeder is disclosed for dissolving a chemical and mixing it with a liquid. The feeder includes a hopper adapted to hold the chemical, a nozzle located in the hopper, and a supply of the liquid to the nozzle to dissolve the chemical on contact with the liquid from the nozzle to form a solution. A solution basin is disposed under the hopper and a drain is provided from the hopper into the solution basin. An outlet from the solution basin has an outlet valve which opens when a solution level in the solution basin rises.