Lectures at Home

ACHROMATIC TELESCOPE Alexander Severus ancient appear Arnott astronomer basin beads beautiful beneath bright burning-glasses called camera-obscura concave mirror contrived converging convex lens cool crown-glass crystalline lens dark deception discovery distance distinct Dollond double convex eclipse ELEUSINIAN MYSTERIES employed experiment eye-glass farther Father Scheiner feet FINDING THE LONGITUDE flint-glass focus Galileo glass globe Greenwich heat HERCULANEUM Hutton ingenious instrument inverted Joyce Jupiter kinds of glass Lardner LECTURE lenses look looking-glass magnified means melted microscope moon Mosaic Mount Etna Mysteries object object-glass observe OPTICAL oven pass perceive person phantom phial picture pieces of glass placed plate-glass PORTLAND VASE power of refraction prism produced quicksilver rays of light rays proceeding reflected REFLECTING TELESCOPES refraction retina Roman round sand seems seen Septimius Severus shilling ship specimen substance suppose surface telescope thing tin-foil TRANSIT OF VENUS transparent tube window word