This near priceless material went by many different names - wad, plumbago, black cawke, black lead, and is more commonly known today simply as graphite. It may seem a little odd that good old pencil lead was once held in such high regard, however, there was a time when it was quite scarce, and only available in its native mineral form. The mining and distribution of graphite was quite tightly controlled. At a time when the annual wage for a labourer was approximately £12, a few hundred pounds of pure graphite could make one a fairly wealthy man, with prices reaching as high as £1,300 a ton at one point. Some of the best, and purest, graphite in the world came from the Borrowdale Mine, located in the historic county of Cumberland (now part of Cumbria).
Then, thanks to the French Revolutionary Wars taking place at the end of the 18th century, and the embargos placed upon France at the time, France found itself facing a severe shortage of pencils. The situation was so dire that one of France's Ministers of War, Lazare Carnot, took on the responsibility of finding a solution. He approached one of the army's bright young officers, Nicholas-Jacques Conte, to request his help in resolving the problem. According to legend, Conte came up with a solution in a mere 8 days. By mixing powdered graphite with clay and then heating it in a kiln, he developed an approach for making different "hardnesses" of pencil leads that is still used today.
Back in England, the demand for the purity of Cumberland lead carried on well into the 19th century, with pencil-makers demanding more and more of the rare commodity. An excerpt from Volume I of the 1839 edition of "The Art Union" describes the situation, and explains why some continued to favour the pure Cumberland lead - "...a most inconvenient mode of supplying the ore to the pencil makers has long prevailed. The mines are opened and worked for a short time, about once a year, or sometimes two years, depending upon the consumption by the Public; the mine is then sealed, and the ore raised sent to London to the owners warehouses; where, once a month, a sale is held, and the purchasers go and select the ore at so much per pound; when this is consumed, if more be required before the day of periodic sale, upon payment of a very heavy fee a large purchaser may get a fresh supply, but it is only of the rejected of the former sale, for there is no fresh supply from the mine until all the stock is sold. The consequence is, that the best pencils are only to be had out of the first selections; from this time they become worse and worse until a fresh supply arrives - of pure Cumberland lead. The largest consumers are now Mordan & Co., and nothing can exceed the care and skill of their selection, and the beautiful machinery with which their pencils are made, so as to ensure the lead of equal size and quality, and perfectly central in the cedar; thin small points too, for the ever-pointed pencils, are made by the most accurate machinery; the advantage of using the native black lead over the common compositions is in the depth and richness of its colour; the pure native ore has often hard particles in it, and these the more frequent as the stock is again and again looked over; but the composition pencils, though sometimes free from this defect, never attain the firmness and richness of the pure Cumberland lead." (author unknown - initials "A.B.")
Here are a few examples of pencil leads & boxes from my collection :
|Mordan Cedar Refills|
|Wm. Lund - Ever-Pointed Lead Refills|
|Wm. S. Hicks - "Finest Cumberland Leads"|
Background on Borrowdale Mine - Industrial History of Cumbria
Wikipedia - Nicolas-Jacques Conte ; Lazare Carnot