A chamber for annealing a semi-conductor material of II-VI type having a first area for storing an element of group II of the periodic table and a second area designed to receive the semi-conductor material of II-VI type. The lift stand is for a musical instrument stand or to elevate a speaker and that rigidly supports a sousaphone brass type instruments or speaker in an in a stored and in a playable or elevated position. The ophthalmic observation apparatus 1 preliminarily stores operation mode information 214, in which various operational details are associated with each operation mode. The magnets extend in general alignment with the coils. This makes it possible to provide a load driving circuit which does not have a reduction in a degree of freedom in selecting a frequency of a PWM control signal that is used to control loads, does not prevent a peripheral circuit from following the PWM control circuit, and prevents generation of sounds. The method may comprise providing a fluid sample downhole from a subterranean formation, applying a reactant to the fluid sample to create a combined fluid, observing the combined fluid, and determining if contaminants are present within the fluid sample based upon the observing the combined fluid.