ABSTRACT
This instrument, the object of the above engraving, and present description, was invented by Friar Bacon more than five hundred years ago. It is of such simple construction as to be easily understood, and represents the objects subjected to it in all their vivid colors, and with so unerring a fidelity, that it has always been a favourite amusement to view its varied and animating pictures. The following is an explanation of its construction:—
