Abstract: A gas exchange device designed to displace existing air or gas inside a pressurizable or inflatable article with an inert, dry gas such as nitrogen. The gas exchange device includes an elongated injection tube which inserts into a valve or opening of a pressurizable or inflatable article. As an inert gas is injected into the article through the elongated injection tube, the interior gas is exhausted through the article valve or opening into an exhaust receiving orifice. The exhausted gas is controlled so that it may be monitored for moisture content.

Abstract: A lens generator for optical eyeglass lenses utilizes a carriage and gauge for adjusting and simultaneously measuring the radial displacement between a quill holder and a fixed location tailstock holding a lens blank. By quickly and accurately adjusting the radial displacement of the quill holder, different types of diamond wheels can be interchanged on the machine very quickly.