sextants, periscope, stereoscope, astrolabe, penlight, caravel, loupe, stereopticon, hieroglyph, eyepiece, lunette, armillary sphere, celestial sphere, portholes, sunstone, cartouche, gnomon, binoculars, celestial navigation, eyehole, magnifying glass, hubble, firelight, quarterdeck, planchette, prow, newel post, reredos, doorknocker, ringlet, shallop, camera obscura, theodolite, trilobite, scallop shell, hipparchus, snuffbox, lighthouse, horsehead, lemon squeezer, bateau, gorget, sundials, sleigh bell, horsehead nebula, telescope, grease pencil, dreamcatcher, monocled, nautilus, pith helmet, chiton, dowsing rod, crenellations, windsock, armorial, artificer, birchbark, moonstones, doubloon, echo sounder, stargazer, philae, hieroglyphic, jolly roger, orb, chambered nautilus, scabbard, tricorn, spectroscope, kepi, whalebone, thunderbirds, voyager, caravels, pinhole camera, trapezoids, adz, cypher, cufflink, hunkers, sea serpent, eratosthenes, sundog, pianola, ferdinand magellan, darning needle, coral necklace, frontispiece, andirons, binnacle, gaze, squint, portcullis, promontories, sunbeam, stereographic, scrimshaw, campanile, hussars, battlement, cruet, cask, lantern, bedstead, bellows, grate, candlestick, coffin, easel, hammer, harpoon, hatchet, knapsack, mirror, paddle, pocketbook, shotgun, tongs, trumpet

refracting telescope

field glass, glass