American Cities A Century Ago

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View of Manhattan Bridge from Brooklyn in 1909.

Note how sharp and clear most of the photos are and these are over a
100 years old.
 
There aren't many old photos as good, remember they didn't have film
or digital photo cards in those days. Most probable is that these were
glass plate images  taken thru a pin hole type camera and the
opening was timed just right to get a dark enough exposure.
Developing was another tedious task and they had to be careful not
to break the glass!