Reproduced from _The Forces of Nature_ (Messrs. Macmillan)
THE GREAT SUN-SPOT OF JULY 17, 1905 22
Yerkes Observatory.
SOLAR PROMINENCES 22
From photographs taken at the Yerkes Observatory.
MARS, OCTOBER 5, 1909 23
Photo: Mount Wilson Observatory.
JUPITER 23
SATURN, NOVEMBER 19, 1911 23
Photo: Professor E. E. Barnard, Yerkes Observatory.
THE SPECTROSCOPE, AN INSTRUMENT FOR ANALYSING LIGHT; IT
PROVIDES MEANS FOR IDENTIFYING SUBSTANCES (_Coloured
Illustration_) 24
THE MOON 28
MARS 29
Drawings by Professor Percival Lowell.
THE MOON, AT NINE AND THREE QUARTER DAYS 29
A MAP OF THE CHIEF PLAINS AND CRATERS OF THE MOON 32
A DIAGRAM OF A STREAM OF METEORS SHOWING THE EARTH PASSING
THROUGH THEM 32
COMET, SEPTEMBER 29, 1908 33
Photo: Royal Observatory, Greenwich.
COMET, OCTOBER 3, 1908 33
Photo: Royal Observatory, Greenwich.
TYPICAL SPECTRA 36
Photo: Harvard College Observatory.
A NEBULAR REGION SOUTH OF ZETA ORIONIS 37
Photo: Mount Wilson Observatory.
STAR CLUSTER IN HERCULES 37
Photo: Astrophysical Observatory, Victoria, British Columbia.
THE GREAT NEBULA IN ORION 40
Photo: Yerkes Observatory.
GIANT SPIRAL NEBULA, MARCH 23, 1914 41
Photo: Lick Observatory.
A SPIRAL NEBULA SEEN EDGE-ON 44
Photo: Mount Wilson Observatory.
100-INCH TELESCOPE, MOUNT WILSON 45
Photo: H. J. Shepstone.
THE YERKES 40-INCH REFRACTOR 48
THE DOUBLE-SLIDE PLATE-HOLDER ON YERKES 40-INCH REFRACTING
TELESCOPE 49
Photo: H. J. Shepstone.
MODERN DIRE
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