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Page ix
... Finding the Longitude , ib . - Difficulty of such Observa- tions at Sea , p . 135 - Various Modes of finding the Longi- tude , p . 136 - Harrison's Time - keeper , p . 139 - Chronometer , the Term explained , p . 140 - New Improvement ...
... Finding the Longitude , ib . - Difficulty of such Observa- tions at Sea , p . 135 - Various Modes of finding the Longi- tude , p . 136 - Harrison's Time - keeper , p . 139 - Chronometer , the Term explained , p . 140 - New Improvement ...
Page 132
... longitude of different places on the earth . Perhaps I may be able to give you some notion of the way in which this ... FINDING THE LONGITUDE . 133 reckon our degrees of longitude Transit of Venus, p 130-Satellites of Jupiter, p 132-
... longitude of different places on the earth . Perhaps I may be able to give you some notion of the way in which this ... FINDING THE LONGITUDE . 133 reckon our degrees of longitude Transit of Venus, p 130-Satellites of Jupiter, p 132-
Page 133
Maria Hack. FINDING THE LONGITUDE . 133 reckon our degrees of longitude - passes over London ; ( to speak quite correctly , I should say over the Royal Observatory , in Greenwich Park ; ) and that the fifteenth degree passes over Mount ...
Maria Hack. FINDING THE LONGITUDE . 133 reckon our degrees of longitude - passes over London ; ( to speak quite correctly , I should say over the Royal Observatory , in Greenwich Park ; ) and that the fifteenth degree passes over Mount ...
Page 134
Maria Hack. 134 FINDING THE LONGITUDE observer finds , on looking at his watch , that it is seven o'clock in the evening , the watch of the Sicilian will show him that it is eight o'clock . This difference of an hour in the watches ...
Maria Hack. 134 FINDING THE LONGITUDE observer finds , on looking at his watch , that it is seven o'clock in the evening , the watch of the Sicilian will show him that it is eight o'clock . This difference of an hour in the watches ...
Page 135
... find the longitude of any place on land . Unfortunately for sailors , who stand most in need of such knowledge , the rolling of the ship often makes it impossible to fix a tele- scope properly . If the satellites of Jupiter could be ...
... find the longitude of any place on land . Unfortunately for sailors , who stand most in need of such knowledge , the rolling of the ship often makes it impossible to fix a tele- scope properly . If the satellites of Jupiter could be ...
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Common terms and phrases
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