Robert Edward Anderson

Summary

Robert Edward Anderson Dictionary of National Biography… (1890)

In 1824, when only a second year's student, Hamilton read before the Royal Irish Academy a 'Memoir on Caustics,' and being invited to develop the subject, he some time after produced a celebrated paper on systems of rays, and predicted 'conical refraction.' Applying the laws of optics he proved that under certain circumstances a ray of light passing through a crystal will emerge not as a single or double ray but as a cone of rays.
Source: Wikisource

Robert Edward Anderson Dictionary of National Biography… (1890)

Dr. Whewell, referring to Hadley's 'sextant,' says:' That invaluable instrument in which the distance of two objects is observed by bringing one to coincide apparently with the other' (Ind. Science, ii. 278) . The circular arc of the instrument being originally one-eighth of a circumference, it was called 'octant,' and as the double reflection makes one degree on the arc represent two degrees between the objects observed, the octant was therefore a measure of ninety degrees, and thus obtained the name quadrant.
Source: Wikisource

Robert Edward Anderson Dictionary of National Biography… (1890)

The truth is that this great book of Hamilton's, as well as his so-called 'Elements of Quaternions,' is frequently unpleasant in style, besides being obscure and difficult of interpretation.
Hamilton's method involved a remarkable extension of science. He showed that the 'impossible quantities' which so frequently occur in analysis admit of easy interpretation by a natural extension of the symbol's meaning. The so-called imaginary or unreal factor really denoted an operation to be performed on the line or surface in question, the operation of rotation.
Source: Wikisource

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