The invention is an improvement in a method of producing a high quality bulk single crystal of silicon carbide in a seeded sublimation system. Preferred embodiments include gravity feed napkin dispensers. The buffer layer comprises at least one of an oxide and a nitride. The method utilizing concentrated sulfuric acid to prepare the main hydrolysate can hydrolyze the maximum cellulose with the least sulfuric acid, thereby decreasing the acid recovery cost proportioned by per kilogram sugar obtained by hydrolysis. A motor mount at the rear of the boat maintains a constant orientation as the boat is folded and unfolded between the reduced width configuration and the greater width configuration. Embodiments include a system which displaces the battery from the same side or opening in which the replacement battery is inserted, and a system which displaces the battery from another opening in the battery chamber.