By moving the slider (top right) you can zoom in on the map. To zoom in even more enter a larger number in the % box (eg 400).
You can drag the map around to see the whole area, or use the horizontal and vertical slide bars.
LARGE SCALE STREET
PLAN OF NEWPORT
Source:
Geographia Ltd
Original Scale 4 inches to One Mile, Price 6d, On Cloth 1/6