Answer | Crossword Clue |
---|---|
refractors | REFRACTOR, a refracting telescope |
refractors | A refracting telescope |
refractor | A refracting telescope |
refractor | a refracting telescope |
heliometer | A refracting telescope with a split objective lens, used for finding the angular distance between two stars |
heliometers | A refracting telescope with a split objective lens, used for finding the angular distance between two stars |