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A peculiar wooden box of dovetail joints, mahogany and brass and an aperture of glass, with the appearance of a tilting rear; swing-out, collapsible bellows casing and screen - a board clamped in position by a threaded metal bar. A memory swings across your scattered thoughts like a pendulum, as you examine this device - something about it fills you with unease, as if you were delicately handling some combustible powder, accompanied by a fear of it startling the horses.