ALVAN CLARK AND SONS
At the end of the nineteenth century, it was the well-heeled and fortunate amateur.astronomer indeed who owned a telescope made by Alvan dark and'Sons.
Based in Massachusetts, this famous company built refractors in sizes from 3 inches (75 mm) on up. Way up! In 1897, Clark's son Alvan Graham completed the optics for the 40 inch (1 m)
Yerkes refractor in Williams Bay, Wisconsin.It remains the largest . working refractor ever made and is still in use. Clark and Sons' smaller refractors for amateurs provide views surpassed by few telescopes today, and are much sought after by collectors of fine optics.