2. They melt it into long plates, which, if the mould do take ayre, then the plate is not of an equal heaviness in every part of it, as it often falls out.
3. They draw these plates between rollers to bring them to an even thickness all along and every plate of the same thickness, and it is very strange how the drawing it twice easily between the rollers will make it as hot as fire, yet cannot touch it.
4. They bring it to another pair of rollers, which they call adjusting it, which bring it to a greater exactness in its thickness than the first could be.
5. They cut them into round pieces, which they do with the greatest ease, speed, and exactness in the world.
6. They weigh these, and where they find any to be too heavy they file them, which they call sizeing them; or light, they lay them by, which is very seldom, but they are of a most exact weight, but however, in the melting, all parts by some accident not being close alike, now and then a difference will be, and, this filing being done, there shall not be any imaginable difference almost between the weight of forty of these against another forty chosen by chance out of all their heaps.
7. These round pieces having been cut out of the plates, which in passing the rollers are bent, they are sometimes a little crooked or swelling out or sinking in, and therefore they have a way of clapping 100 or 2 together into an engine, which with a screw presses them so hard that they come out as flat as is possible.
8. They blanch them.
9. They mark the letters on the edges, which is kept as the great secret by Blondeau, who was not in the way, and so I did not speak with him to-day.
[Professor W. C. Roberts-Austen, C.B., F.R.S., chemist to the Royal
Mint, refers to Pepys's Diary and to Blondeau's machine in his
Cantor Lectures on "Alloys used for Coinage," printed in the
"journal of the Society of Arts" (vol. xxxii.). He writes, "The
hammer was still retained for coining in the Mint in the Tower of
London, but the question of the adoption of the screw-press by the
Moneyers appears to have been revived in 1649, when the Council of
State had it represented to them that the coins of the Government
might be more perfectly and beautifully done, and made equal to any
coins in Europe. It was proposed to send to France for Peter
Blondeau, who had invented and improved a machine and method for
making all coins 'with the most beautiful polish and equality on the
edge, or with any proper inscription or graining.' He came on the
3rd of September, and although a Committee of the Mint reported in
favour of his method of coining, the Company of Moneyers, who appear
to have boasted of the success of their predecessors in opposing the
introduction of the mill and screw-press in Queen Elizabeth's reign,
prevented the introduction of the machinery, and consequently he did
not produce pattern pieces until 1653.... It is certain that
Blondeau did not invent, but only improved the method of coining by
the screw-press, and I believe his improvements related chiefly to a
method for 'rounding the pieces before they are sized, and in making
the edges of the moneys with letters and graining,' which he
undertook to reveal to the king. Special stress is laid on the
engines wherewith the rims were marked, 'which might be kept secret
among few men.' I cannot find that there is any record in the Paris
mint of Blondeau's employment there, and the only reference to his
invention in the Mint records of this country refers to the
'collars,' or perforated discs of metal surrounding the 'blank'
while it was struck into a coin. There is, however, in the British
Museum a MS. believed to be in Blondeau's hand, in which he claims
his process, 'as a new invention, to make a handsome coyne, than can
be found in all the world besides, viz., that shall not only be
stamped on both flat sides, but shall even be marked with letters on
the thickness of the brim.' The letters were raised. The press
Blondeau used was, I believe, the ordinary screw-press, and I
suppose that the presses drawn in Akerman's well-known plate of the
coining-room of the Mint in the Tower, published in 1803 ['Microcosm
of London,' vol. ii., p. 202], if not actually the same machines,
were similar to those erected in 1661-62 by Sir William Parkhurst
and Sir Anthony St. Leger, wardens of the Mint, at a cost of L1400,
Professor Roberts-Austen shows that Benvenuto Cellini used a similar
press to that attributed to Blondeau, and he gives an illustration
of this in his lecture (p. 810). In a letter to the editor the
professor writes: "Pepys's account of the operations of coining, and
especially of assaying gold and silver, is very interesting and
singularly accurate considering that he could not have had technical
knowledge of the subject.">[
10. They mill them, that is, put on the marks on both sides at once with great exactness and speed, and then the money is perfect. The mill is after this manner: one of the dyes, which has one side of the piece cut, is fastened to a thing fixed below, and the other dye (and they tell me a payre of dyes will last the marking of L10,000 before it be worn out, they and all other their tools being made of hardened steel, and the Dutchman who makes them is an admirable artist, and has so much by the pound for every pound that is coyned to find a constant supply of dyes) to an engine above, which is moveable by a screw, which is pulled by men; and then a piece being clapped by one sitting below between the two dyes, when they meet the impression is set, and then the man with his finger strikes off the piece and claps another in, and then the other men they pull again and that is marked, and then another and another with great speed. They say that this way is more charge to the King than the old way, but it is neater, freer from clipping or counterfeiting, the putting of the words upon the edges being not to be done (though counterfeited) without an engine of the charge and noise that no counterfeit will be at or venture upon, and it employs as many men as the old and speedier. They now coyne between L16 and L24,000 in a week. At dinner they did discourse very finely to us of the probability that there is a vast deal of money hid in the land, from this:—that in King Charles's time there was near ten millions of money coyned, besides what was then in being of King James's and Queene Elizabeth's, of which there is a good deal at this day in being. Next, that there was but L750,000 coyned of the Harp and Crosse money,