The New Student's Reference Work/Solar Microscope

So′lar Mi′croscope, a modified form of magic-lantern, not much used now that gas-lanterns and electric lanterns have become so easily available.  The only essential difference between the solar microscope and the ordinary magic-lantern is that in the former a beam of sunlight, reflected from a heliostat or porti-lumiere, is employed instead of oil, gas or the electric arc for illuminating the slide.