This was finished and mounted in November, 1873.

Another instrument of similar size and power was manufactured by Mr.Clark for the University of Virginia.
But these instruments did not long maintain their supremacy.

In 1881, Mr.Howard Grubb, of Dublin, manufactured a still larger instrument for the Austrian Government--the object-glass being of twenty-seven inches aperture.

But Mr.Alvan Clark was not to be beaten.

In 1882, he supplied the Russian Government with the largest refracting telescope in existence the object-glass being of thirty inches diameter.