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October, in the fifth year of His reign, did, for
Himself, His heirs and successors, give and grant unto me, the said Joseph Aspdin, His special licence, that I, the said Joseph Aspdin, my exors, admors, and assigns, should at any time agree with, and no others, from time to time at all time during the term of years therein expressed, should and lawfully might make, use, exercise, and vend, within England, Wales and the Town of Berwick-upon-Tweed, my invention of "AN IMPROVEMENT IN THE MODE OF PRODUCING AN ARTIFICIAL STONE;" in which said Letters Patent there is contained a proviso obliging me, said Joseph Aspdin, by an instrument in writing under my hand and seal, particularly to describe and ascertain the nature of my said invention, and in what manner the same is to be performed, and to cause the same to be inrolled in his Majesty's High Court of Chancery within two calendar months next and immediately after the date of the said part recited Letters Patent (as in and by the same), reference being thereunto had, will more fully and at large appear.
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under or near the pan till the water is entirely evaporated. Then I brake the said mixture into suitable lumps and calcine them in a furnace similar to a lime kiln till the carbonic acid is entirely expelled. The mixture so calcined is to be ground, beat, or rolled to a fine powder, and is then in a fit state for making cement or artificial stone. This powder is to be mixed with a sufficient quantity of water to bring it into the consistency of mortar, and thus applied to the purposes wanted.
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417:. The characteristic practise of the patent (and of his lime patent) is the use of "road sweepings" as a raw material. He says that if the sweepings are not available he obtains 'the limestone itself". It is significant that Joseph Aspdin was twice prosecuted for digging up whole paving blocks from the local roads. Limestone supply was clearly a major headache for Aspdin in the days before stone could be brought in by rail.
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363:". Portland stone was the most prestigious building stone in use in England at the time. The patent clearly does not describe the product recognised as Portland cement today. The product was aimed at the market for stuccos and architectural pre-cast mouldings, for which a fast-setting, low-strength cement was required (see cement). It was fired at low temperature (below 1250 °C) and therefore contained no
167:, was running the plant. However, in 1841, Joseph went into partnership with James, and posted a notice that William had left, and that the company would not be responsible for his debts, stating "I think it right to give notice that my late agent, William Aspdin, is not now in my employment, and that he is not authorised to receive any money, nor contract any debts on my behalf or on behalf of the new firm."
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178:. There he introduced a new and substantially stronger cement, using a modified recipe for cement-making, the first "modern" Portland cement. In 1844 Joseph retired, transferring his share of the business to James. James moved to a third site at Ings Road in 1848, and this plant continued in operation until 1900. Joseph Aspdin died on 20 March 1855, at home in Wakefield.
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My method of making a cement or artificial stone for stuccoing buildings, waterworks, cisterns, or any other purpose to which it may be applicable (and which I call
Portland cement) is as follows:- I take a specific quantity of limestone, such as that generally used for making or repairing roads, and
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AND BE IT REMEMBERED, that on the
Fifteenth day of December, in the year of our Lord 1824, and aforesaid Joseph Aspdin came before our said Lord the King in His Chancery, and acknowledged the Specification aforesaid, and all and every thing therein contained and specified, in form above written. And
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TO ALL TO WHOM THESE PRESENTS SHALL COME, I, Joseph Aspdin, of Leeds, in the County of York, Bricklayer, send greeting. WHEREAS His present most
Excellent Majesty King George the Fourth, by His Letters Patent under the Great Seal of Great Britain, bearing date at Westminster, the Twenty-first day of
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is burned on its own first, then slaked, mixed with clay, and burned again. This was a common practice for manufacturers of both
Artificial and Portland cements when only hard limestones were available. The grinding technology of the time consisted only of flat millstones, and it was more economic
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earth or clay, and mix them with water to a state approaching impalpability, either by manual labour or machinery. After this proceeding I put the above mixture into a slip pan for evaporation, either by heat of the sun or by submitting it to the action of fire or steam conveyed in flues or pipe
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I take it from the roads after it is reduced to a puddle or powder; but if I cannot procure a sufficient quantity of the above from the roads, I obtain the limestone itself, and I cause the puddle or powder, or the limestone, as the case may be, to be calcined. I then take a specific quantity of
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NOW KNOW YE, that in compliance with the said proviso, I, the said Joseph Aspdin, do hereby declare the nature of my said
Invention, and the manner in which the same is to be performed, are particularly described and ascertained in the following description thereof (that is to
156:. Beverley stayed in Leeds, but Aspdin and his family moved to Wakefield (about nine miles away) at this point. He obtained a second patent, for a method of making lime, in 1825. The Kirkgate plant was closed in 1838 after compulsory purchase of the land by the
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were available. A history of "financial missteps" and questionable business arrangements suggests that
William may have been both inept and dishonest. Nonetheless, he is credited with launching the "modern" Portland cement industry.
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By 1817, he had set up in business on his own in central Leeds. He must have experimented with cement manufacture during the next few years, because on 21 October 1824 he was granted the
British Patent BP 5022 entitled
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material, hence increasing wear-and-tear in the grinding process. However, William did not file for a patent on his modified process, and sometimes claimed his father's patent. In 1848, William moved south to
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In witness whereof, I, the said Joseph Aspdin, have hereunto set my hand seal, this
Fifteenth day of December, in the year of our Lord One thousand eight hundred and twenty-four.
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His son
William's innovation was to make a mix with a higher limestone content, to burn it at a higher temperature using more fuel, and to grind the hitherto-discarded hard
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Almost immediately after this, in 1825, in partnership with a Leeds neighbour, William Beverley, he set up a production plant for this product in
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Patent nr. BP 5022, "An Improvement in the Modes of Producing an Artificial Stone", Joseph Aspdin, 21 October 1824, page 2/2
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Patent nr. BP 5022, "An Improvement in the Modes of Producing an Artificial Stone", Joseph Aspdin, 21 October 1824, page 1/2
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Inrolled the Eighteenth day of December, in the year of our Lord One thousand eight hundred and twenty-four.
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also the Specification aforesaid was stamped according to the tenor of the statute made for that purpose.
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Concrete planet : the strange and fascinating story of the world's most common man-made material
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Joseph Aspdin called the product Portland cement because set mortar made from it resembled “the best
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Aspdin (or Aspden) was the eldest of the six children of Thomas Aspdin, a bricklayer living in the
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The product belongs to the category of "artificial cements" that were developed to compete with
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At this time his eldest son James was working as an accountant in Leeds, and his younger son,
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to pulverize the limestone by burning and slaking than by grinding.
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of the area, which was used for paving in the towns and on the
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Plaque commemorating Joseph Aspdin in the yard where he lived.
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An Improvement in the Mode of Producing an Artificial Stone
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that is quarried on the channel coast of England, on the
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145:in Dorset. See below for the text of the patent.
585:The cement industry, 1796-1914 : a history
524:(4th ed.). Oxford: Butterworth-Heinemann.
16:English inventor of Portland cement (1778–1855)
170:In 1843, William established his own plant at
81:Bricklayer, businessman, inventor, stonemason
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564:(2). Chemical Heritage Foundation: 36–37
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158:Manchester and Leeds Railway Company
699:People of the Industrial Revolution
587:. Newton Abbot: David and Charles.
490:. Amherst, N.Y.: Prometheus Books.
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611:Johnson, Alfred Sidney (1911).
518:Hewlett, Peter C., ed. (2001).
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