While the square Hayward Prismatic Pavement Lights (patented in 1871) can still be found across Glasgow, Hyatt Lights with their round lenses are an older version, being patented in 1845, and are much rarer.

In fact, the 1854 tobacco warehouse on James Watt Street in Anderston where I took this picture is the only place I've seen them so far in the city.

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