The introduction of a revolving frame proved a valuable source of distinction amongst lights.
Alan Stevenson[1]
To Fresnel belongs the additional merit of having first followed up his invention by the construction of a lens.
Alan Stevenson[1]
The dioptric system has been adopted to the complete exclusion of the catoptric.
Alan Stevenson[1]
His labors will be felt and acknowledged wherever maritime intercourse prevails.
Alan Stevenson[1]
Fresnel has produced many ingenious combinations of dioptric instruments for lighthouses.
Alan Stevenson[1]
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