 | John Feltham - 1813 - 368 pages
...fifteen patent lamps, each placed in a large copper reiiector, plated, and ran«ed round an upright axis, kept in continual motion by jack-work, wound up every five hours and a hali, by which means a set of five reflectors are presented to the eye every minute, the axis being... | |
 | Thomas Cromwell - 1818 - 368 pages
...plated in the inside \. these placed round an upright axis, are kept in continual motion by machinery wound up every five hours and a half, by which means a set of five reflectors are presented to the eye in a full blaze of light every minute, the axis being... | |
 | Thomas Cromwell - 1818 - 332 pages
...plated in the inside ; these placed round an upright axis, are kept in continual motion by machinery wound up every five hours and a half, by which means a set of five reflectors are presented to the eye in a full blaze of light every minute, the axis being... | |
 | Thomas Kitson Cromwell - 1819 - 676 pages
...plated in the inside ; these placed round an upright axis, are kept in continual motion by machinery wound up every five hours and a half, by which means a set of five reflectors are presented to the eye in a full blaze of light every minute, the axis being... | |
 | John Chambers - 1829 - 530 pages
...plated in the inside ; these, placed round an upright axis, are kept in continual motion by machinery, wound up every five hours and a half, by which means a set of five reflectors are presented to the eye in a full blaze of light every minute, the axis being... | |
 | John Chambers - 1829 - 698 pages
...plated in the inside ; these, placed round an upright axis, are kept in continual motion by machinery, wound up every five hours and a half, by which means a set of five reflectors are presented to the eye in a full blaze of light every minute, the axis being... | |
 | Walter Rye - 1889 - 292 pages
...plated in the inside ; these, placed round an upright axis, are kept in continual motion by machinery, wound up every five hours and a half, by which means a set of five reflectors are presented to the eye in a full blaze of light every minute, the axis being... | |
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... The tower, built of brick, is only three moderate stories high, crowned with a lantern lighted by fifteen patent lamps, each placed in a large copper reflector, three feet in diameter, and finely plated in the inside ; these, placed round an upright... 