An engraving depicting a Fresnel echelon or lighthouse lens from the front and side. At A is a plano-convex lens a foot in diameter surrounded by glass rings whose curvature is calculated so that they have the same focus as A. M, N are mirrors which turn light which escapes the lens into the same path as the primary beam. Dated 19th century.

px px dpi = cm x cm = MB
Details

Creative#:

TOP25359001

Source:

達志影像

Authorization Type:

RM

Release Information:

須由TPG 完整授權

Model Release:

No

Property Release:

No

Right to Privacy:

No

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Same folder images