To have an answer I have to sort of play the game of six degrees of Benjamin Franklin... You see, Ben was a big fan of glass production being done in the American colonies. He wrote this description as given to me by the archivist at Wheaton Village of the Caspar Wistar enterprise:
More specific information about the operation of the glasshouse can be learned from Benjamin Franklin. In 1746 he received a letter from Thomas Darling of New Haven who wanted to build a glasshouse in Connecticut. Darling had heard of Wistar's undertaking and sent Franklin a list of detailed questions. Franklin was in a good position to answer this query. He was a neighbor of Wistar's on Market Street and the request came just at the time when Franklin was working closely with Wistar on the production of glass needed for his scientific experiments.
Franklin describes the furnace as a rectangular one typical of German technology: "about 12 foot long, 8 wide, 6 high, has no Grate, the Fire being made on its Floor...On each Side in the Furnace is a Bench or Bank of the same Materials with Furnace, on which the Pots of Metal stand, 3 or 4 of a Side." He noted that the furnace was built of bricks of white clay which needed to be "renew'd every Blast." As Wistar told Governor Belcher, "The Clay for the Furnace bottoms was but poor and often gave way." Franklin reported that the glasshouse consumed 2,400 cords of wood annually. The heat of the furnaces was so intense that in the New Jersey climate the glassblowers could only work from October to May. ...Although the four original blowers must have trained others in the glassblowing trade over the years, additional master gaffers were required. In time a family of glass craftsmen by the name of Stanger or Stenger was secured. They are best known for the numerous New Jersey glasshouses they founded after Wistarburgh closed. Johan Adam Stanger and his six sons landed in Philadelphia in 1768 and apparently assumed a leading role at Wistarburgh, although no factory records are available to document this. Besides Peter Halter, the only other glassblower who has been identified for the later period is Andrew Road, who died in 1780.
Now, I descend from two Anna Stengers married to Walter men
https://www.wikitree.com/wiki/Stenger-199 and https://www.wikitree.com/wiki/Stenger-211
These women were both related to the Colonial Stengers who became Stanger in New Jersey. So what does this have to do with taxes? Back to the document from Wheaton Village:
While some colonial authorities seemed to ignore the Crown policy towards manufactures, the New Jersey House of Representatives seemed, in the opinion of the Wistars, to be acting against the interests of the Colonies. When the House determined to increase the taxes levied on the glassworks, the partners petitioned for relief, pointing out that "the Making of Glass is...a Considerable Advantage to the Country, not only as it saves the Money that must otherwise be sent abroad for that Commodity, but as it brings Cash in, for Quantities exported to other Colonies." British policy notwithstanding, they stated that "it is no unusual Thing in Wise Governments to encourage new Manufactures, by Granting Bounties and Immunities to those who Introduce them."
In this same period the company faced county taxes that had risen dramatically; in 1746 the glassworks paid twenty shillings, besides an additional charge levied on Wistar for his role as a merchant. The following year the glasshouse tax was forty shillings and by 1749 the amount was increased to three pounds.
