From the Wikipedia page 
The Sri Lanka Tea Board opened a Tea Museum in Hantana, Kandy in 2001. Although exhibits are not abundant they do provide a valuable insight into how tea was manufactured in the early days. Old machinery, some dating back more than a century, has been lovingly restored to working order. The first exhibit that greets visitors is the Ruston and Hornsby developed diesel engine, as well as other liquid fuel engines, located in the Engine Room on the ground floor of the museum. Power for the tea estates were also obtained by water-driven turbines.
The museum's "Rolling Room" offers a glimpse into the development of manufacturing techniques, with its collection of rollers. Here the showpiece is the manually operated 'Little Giant Tea Roller'.
The museum's website is here