Uttmark's guide to the United States local inspectors examination for masters and mates of ocean going steam and sailing ships (1919)
Uttmark, Fritz E · [New York] The Author · leaf 45
Fig. 32. UTTMARKS GUIDE … 49.—*What is Refraction? Refraction is the bendingof a ray of light when passingthrough the atmosphere. Itrenders the observed altitudeto appear greater than its realvalue. The angles S 0 S is re-fraction. (Fig. 33.)Fig. 33. SO.—*What is Parallax? Parallax is the angle of theearths radius at the…
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