Insufficient Discriminant Validity: A Comment on Bove, Pervan, Beatty and Shiu (2009)

An apparatus and method for testing one or more glass light bulbs assembled into a sub-assembly for cracks. The apparatus comprises a chamber having an enclosed hollow interior and a door that is adapted to open and close to either allow access to the hollow interior or to seal the hollow interior; a test tray assembly having a plurality of compartments for receiving and holding a plurality of glass light bulbs and sub-assemblies to be tested, said tray assembly adapted and dimensioned to be placed into and enclosed by said chamber; a control assembly for controlling the introduction of oxygen into said chamber; and a source of pressurized oxygen connected to said chamber to supply oxygen under pressure to said chamber under the control of said control assembly.