Science Source General Science

EN_90286236_0091

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caption

Brass Sundial with Green Patina. Sundial measure time by the positioning of the sun. The green coloring on this sundial comes from Patina which forms on weathered surfaces as chemical compounds, such as oxides or carbonates gather.

headline Science Source General Science

created date 2010-02-13

credit EAST NEWS

source Science Source

byline Charles D. Winters

original transmission reference bj3980

weight 1,26MB

size 21cm x 31cm by 300dpi

keywords - Show

AS, BRASS, BY, CARBONATES, CHARLES, CHEMICAL, COLORING, COMES, COMPOUNDS, DIAL, FORMS, FROM, GATHER, GREEN, MEASURE, OF, ON, OR, OXIDES, PATINA, POSITIONING, SUCH, SUN, SUNDIAL, SURFACES, THE, THIS, TIME, WEATHERED, WHICH, WINTERS, WITH,