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Herschel finished his observations of a comet that was visible in January, 1807, with the following remark: "Of the sixteen telescopic comets that I have examined, fourteen had no solid body visible at their centre; the other two exhibited a central light, very ill defined, that might be termed a nucleus, but a light that certainly could not deserve the name of a disk."
It comprises a wheel of insulating material in which 30 or more metal segments are set in an insulating disk as shown at D. A metal contact called a brush is fixed on either side of the wheel. It costs about $7.00 and the motor to drive it is extra.
The yew trees, shaped like stags or armchairs, succeeded to the tree that seemed thunder-stricken, extending transversely from the elm row to the arbour, where tomatoes hung like stalactites. Here and there a sunflower showed its yellow disk. The Chinese pagoda, painted red, seemed a lighthouse on the hillock.
Heavy shadows hung in the foliage of the elms, the clover had closed, and the quiet moths had taken the place of the humming bees. Southwards, the full moon, a red-yellow disk, shone over the wheat, which appeared the finest pale amber.
I place nymphs of all the species that come to hand in glass tubes of the same diameter as the natal cell, lined with coarse paper, which will provide a good purchase for the boring. The obstacle to be pierced varies: a cork a centimetre thick; a plug of poplar, very much softened by decay; a circular disk of sound wood.
Let me find them morning after morning, the starry-white petals radiating, striving upwards to their ideal. Let me see the idle shadows resting on the white dust; let me hear the humble-bees, and stay to look down on the rich dandelion disk.
Although the wind was lulled, petulant little pillars of sand still arose here and there among the boulders, and sank down again, as if exhausted; the descending sun had emerged, a lurid disk, framed in a sulphureous halo that melted imperceptibly into the gold of the west.
I could distinguish so perfectly the spots of the moon, that it might have been supposed its disk was before the clouds.
The sun presented a reddish disk; the whole surface of the ocean became nebulous, and the air which we breathed, depositing a fine sand, an impalpable powder, penetrated to our lungs, already parched with a burning thirst. In this state of torment we remained till four in the afternoon, when a breeze from the north-west brought us some relief.
In earlier years when we used to read Keats together, who most of all of the world's poets felt the things that pass, even then I was wondering at the way in which he brings this out: that to understand Sorrow it must be separated from sorrows: they would be like shadows darkening the bright disk of life's clear tragedy, thus rendering it less bravely seen.
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