Abstract: A method of making a glass includes batching constituents, including silica, alumina, boria, magnesia, quicklime, and strontia, where one or more of the constituents is from “dirty” raw material that includes a relatively large amount of sulfur. The method further includes melting and mixing the batch to make glass having sulfur content but free of blisters, suitable for high performance displays.

Abstract: A pump that is composed of a bladder (1)(7)(8) for pumping fluid by alternately compressing and expanding the bladder. The bladder has at least one input connector (2a) with a one-way valve (3a) therein and at least one output connector (2b) with a one-way valve (3b) therein, in order to provide one-way flow of fluid through the bladder. The pump (illustrated by “B front view”) is positioned to be acted upon by the driving force of a human foot or foot with shoe pushing down on the bladder (5)(5a) to compress the bladder. Working in conjunction with the bladder, but not necessarily part of the fluid pump, is a fixed surface (6) to hold the bladder and repel the driving force. The bladder expands by resuming its normal shape after the driving force has been removed. This expansion causes the bladder to re-fill with liquid that is in turn expelled by another cycle of manual force.