The iron put into the furnace was old Bushes, which thou knowest are always made of hard iron, and the iron drawn out is the toughest I ever saw.

A bar 1 1/4 inch square, when broke, appears to have very little cold short in it.
I look upon it as one of the most important discoveries ever made, and take the liberty of recommending thee and earnestly requesting thou wouldst take out a patent for it immediately....

The specification of the invention will be comprised in a few words, as it will only set forth that a reverberatory furnace being built of a proper construction, the pig or cast iron is put into it, and without the addition of anything else than common raw pit coal, is converted into good malleable iron, and, being taken red-hot from the reverberatory furnace to the forge hammer, is drawn out into bars of various shapes and sizes, according to the will of the workmen." Mr.Reynolds's advice was implicitly followed.

A patent was secured in the name of the brothers Cranege, dated the 17th June, 1766; and the identical words in the above letter were adopted in the specification as descriptive of the process.

By this method of puddling, as it is termed, the manufacturer was thenceforward enabled to produce iron in increased quantity at a large reduction in price; and though the invention of the Craneges was greatly improved upon by Onions, and subsequently by Cort, there can be no doubt as to the originality and the importance of their invention.