4. THE WEIGHT OF OLD GLASS
In his privately circulated book on “English Baluster Stemmed Glasses of the Seventeenth and Eighteenth Centuries” Mr. Francis Buckley aptly says that “English-made glasses of the first period were all light in weight and cloudy in appearance. Some time between the Restoration and the end of the seventeenth century, but when precisely it is difficult to say, the English glass-makers began to try experiments with a view to removing from their glasses this dull and cloudy appearance. Their object was to produce a substance like crystal; and this object they eventually achieved by introducing into their metal a large quantity of lead.” This gave the characteristic weight.
The old Dutch glass seems light in weight, even when it is thick; old English and Irish glass seems relatively heavy even when it is thin. Waterford glass is especially heavy. These differences in weight are probably due to differences in the materials used for mixing the metal; but whatever the cause, they aid the collector to know the real from the counterfeit, and the old English from the Dutch. Even the thick, clumsy glasses made here in the reign of William and Mary seem more weighty than those otherwise exactly similar which were then brought over from Holland.