James Nasmyth: Engineer; an autobiography Part 19

All that was then required to produce a most effective hammer was simply to admit steam of sufficient pressure into the cylinder, so as to act on the under-side of the piston, and thus to raise the hammer-block attached to the end of the piston rod. By a very simple arrangement of a slide valve, under the control of all attendant, the steam was allowed to escape and thus permit the ma.s.sive block of iron rapidly to descend by its own gravity upon the work then upon the anvil.

Thus, by the more or less rapid manner in which the attendant allowed the steam to enter or escape from the cylinder, any required number or any intensity of blows could be delivered. Their succession might be modified in an instant. The hammer might be arrested and suspended according to the requirements of the work. The workman might thus, as it were, think in blows. He might deal them out on to the ponderous glowing ma.s.s, and mould or knead it into the desired form as if it were a lump of clay; or pat it with gentle taps according to his will, or at the desire of the forgeman.

Rude and rapidly sketched out as it was, this, my first delineation of the steam hammer, will be found to comprise all the essential elements of the invention. Every detail of the drawing retains to this day the form and arrangement which I gave to it forty-three years ago.

I believed that the steam hammer would prove practically successful; and I looked forward to its general employment in the forging of heavy ma.s.ses of iron. It is no small gratification to me now, when I look over my rude and hasty first sketch, to find that I hit the mark so exactly, not only in the general structure but in the details; and that the invention as I then conceived it and put it into shape, still retains its form and arrangements intact in the thousands of steam hammers that are now doing good service in the mechanical arts throughout the civilised world.

But to return to my correspondence with the Great Western Steams.h.i.+p Company. I wrote at once to Mr. Humphries, and sent him a sketch of my proposed steam hammer. I told him that I felt a.s.sured he would now be able to overcome his difficulty, and that the paddle-shaft of the Great Britain might now be forged. Mr. Humphries was delighted with my design. He submitted it to Mr. Brunel, engineer-in-chief of the steams.h.i.+p: to Mr. Guppy, the managing director; and to other persons interested in the undertaking,--by all of whom it was heartily approved. I accordingly gave the Company permission to communicate my design to such forge proprietors as might feel disposed to erect the steam hammer, the only condition that I made being, that in the event of its being adopted I was to be allowed to supply it in accordance with my design.

But the paddle-shaft of the Great Britain was never forged. About that time the subst.i.tution of the Screw for the paddle-wheel as a means of propulsion was attracting much attention. The performances of the Archimedes, as arranged by Mr. Francis P. Smith, were so satisfactory that Mr. Brunel, after he had made an excursion in that vessel, recommended the directors to adopt the new propelling power. After much discussion, they yielded to his strongly-urged advice. The consequence was, that the great engines which Mr. Humphries had so elaborately designed, and which were far advanced in construction, were given up, to his inexpressible regret and mortification, as he had pinned his highest hopes as a practical engineer on the results of their performance. And, to crown his distress, he was ordered to produce fresh designs of engines specially suited for screw propulsion.

Mr. Humphries was a man of the most sensitive and sanguine const.i.tution of mind. The labour and the anxiety which he had already undergone, and perhaps the disappointment of his hopes, proved too much for him; and a brain fever carried him off after a few days' illness.

There was thus, for a time, an end of the steam hammer required for forging the paddle-shaft of the Great Britain.

Very bad times for the iron-trade, and for all mechanical undertakings, set in about this time. A wide-spread depression affected all conditions of industry Although I wrote to the heads of all the great firms, urging the importance of my invention, and forwarding designs of my steam hammer, I was unable to obtain a single order. It is true, they cordially approved of my plan, and were greatly struck by its simplicity, unity, and apparent power.*

[footnote...

Among the heads of firms who sent me cordial congratulations on my design, were Benjamin Hick, of the Soho Ironworks, Bolton, a man, whose judgment in all matters connected with engineering and mechanical construction was held in the very highest regard; Messrs. Rushton and Eckersley, Bolton Ironworks; Messrs. Howard and Ravenhill, Rotherhithe Ironworks, London; Messrs. Hawkes, Crashaw, and Company, Newcastle-upon-Tyne; George Thorneycroft, Wolverhampton; and others.

But the substance of their replies was, that they had not sufficient orders to keep the forge hammers they already possessed in work.

They promised, however, that in the event of trade recovering from its depression, they would probably adopt the new power.

In the meantime my invention was taken up in an entirely new and unexpected quarter. I had for some years been supplying foreign customers with self-acting machine tools. The princ.i.p.als of continental manufacturing establishments were accustomed to make frequent visits to England for the purpose of purchasing various machine tools required for the production of the ponderous as well as the lighter parts of their machinery. We gave our foreign visitors every facility and opportunity for seeing our own tools at work, and they were often so much pleased that, when they came to order one special tool, they ended by ordering many,--the machine tools in full activity thus acting as their most effective advertis.e.m.e.nts.

In like manner I freely opened my Scheme Book to any foreign visitors.*

[footnote...

Some establishments in the same line of business were jealous of the visit of foreigners; but to our views, restriction in the communication of new ideas on mechanical subjects to foreigners of intelligence and enterprising spirit served no good purpose, as the foreign engineer was certain to obtain all the information he was in quest of from the drawings in the Patent Office, or from the admirable engravings contained in the engineering publications of the day. It was better to derive the advantage of supplying them with the machines they were in quest of, than to wait until the demand was supplied by foreigners themselves.

There I let them see the mechanical thoughts that were pa.s.sing through my mind, reduced to pen and ink drawings. I did not hesitate to advocate the advantage of my steam hammer over every other method of forging heavy ma.s.ses of iron; and I pointed out the drawing in my Scheme Book in confirmation of my views. The book was kept in the office to be handy for such occasions; and in many cases it was the means of suggesting ideas of machine tools to our customers, and thus led to orders which might not have been obtained without this effective method of prompting them. Amongst our foreign visitors was M. Schneider, proprietor of the great ironworks at Creuzot, in France.

We had supplied him with various machine tools, and he was so pleased with their action that the next time he came to England he called at our office at Patricroft. M. Bourdon, his mechanical manager, accompanied him.

I happened to be absent on a journey at the time; but my partner, Mr. Gaskell, was present. After showing them over the works, as an act of courtesy he brought them my Scheme Book and allowed them to examine it. He pointed out the drawing of my steam hammer, and told them the purpose for which it was intended. They were impressed with its simplicity and apparent practical utility,--so much so, that M. Bourdon took careful notes and sketches of the constructive details of the hammer.

I was informed on my return of the visit of MM.Schneider and Bourdon, but the circ.u.mstance of their having inspected the designs in my Scheme Book, and especially my original design of the steam hammer, was regarded by my partner as too ordinary and trivial an incident of their visit to be mentioned to me. The exhibition of my mechanical designs to visitors at the Foundry was a matter of almost daily occurrence.

I was, therefore, in entire ignorance of the fact that these foreign visitors had taken with them to France a copy of the plan and details of my steam hammer.

It was not until my visit to France in April 1842 that the upshot of their visit was brought under my notice in an extraordinary manner.

I was requested by M. Bouchier, Minister of Marine, to visit the French dockyards and a.r.s.enals for the purpose of conferring with the director of each with reference to the supply of various machine tools for the proper equipment of the marine engine factories in connection with the Royal Dockyards. In order to render this journey more effective and instructive, I visited most of the French engineering establishments which had been supplied with machine tools by our firm.

Amongst these was of course the famous firm of Schneider, whose works at Creuzot lay not far out of the way of my return journey accordingly made my way thither, and found M. Bourdon at his post, though M. Schneider was absent.

M. Bourdon received me with much cordiality. As he spoke English with fluency I was fortunate in finding him present, in order to show me over the works; on entering which, one of the things that particularly struck me was the excellence of a large wrought-iron marine engine single crank, forged with a remarkable degree of exactness in its general form. I observed also that the large eye of the crank had been punched and drifted with extraordinary smoothness and truth.

I inquired of M. Bourdon "how that crank had been forged?"

His immediate reply was, "It was forged by your steam hammer!"

Great was my surprise and pleasure at hearing this statement.

I asked him how he had come to be acquainted with my steam hammer?

He then narrated the circ.u.mstance of his visit to the Bridgewater Foundry during my absence. He told me of my partner having exhibited to him the original design, and how much he was struck by its simplicity and probable efficiency; that he had taken careful note and sketches on the spot; that among the first things he did after his return to Creuzot was to put in hand the necessary work for the erection of a steam hammer; and that the results had in all respects realised the high expectations he had formed of it.

M. Bourdon conducted me to the forge department of the works, that I might, as he said, "see my own child;" and there it was, in truth--a thumping child of my brain. Until then it had only existed in my scheme book; and yet it had often and often been before my mind's eye in full action. On inspecting the steam hammer I found that Bourdon had omitted some important details, which had led to a few mishaps, especially with respect to the frequent breaking of the piston-rod at its junction with the hammer block. He had effected this, in the usual way, by means of a cutter wedge through the rod; but he told me that it often broke through the severe jar during the action of the hammer. I sketched for him, then and there, in full size on a board,the elastic packing under the end of the piston-rod, which acted, as I told him, like the cartilage between the bones of the vertebrae, preventing the destructive effects of violent jars.

I also communicated to him a few other important details, which he had missed in his hasty inspection of my design. Indeed, I felt great pleasure in doing so, as I found Bourdon to be a most intelligent mechanic, and thoroughly able to appreciate the practical value of the information I communicated to him. He expressed his obligation to me in the warmest terms, and the alterations which he shortly afterwards effected in the steam hammer, in accordance with my plans, enabled it to accomplish everything that he could desire.

I had not yet taken out a patent for the steam hammer. The reason was this. The cost of a patent at the time I invented it was little short of #500, all expenses included. My partner was unwilling to lay out so large a sum upon an invention for which there seemed to be so little demand at that time; and I myself had the whole of my capital embarked in the concern. Besides, the general depression still continued in the iron trade; and we had use for every farthing of money we possessed.

I had been warned of the risk I ran by freely exhibiting my original design, as well as by sending drawings of it to those who I thought were most likely to bring the invention into use. But nothing had as yet been done in England. It was left for France, as I have described, to embody my invention in an actual steam hammer. I now became alarmed, and feared lest I should lose the benefits of my invention.

As my partner declined to help me, I applied to my brother-in-law, William Bennett. He was a practical engineer, and had expressed himself as highly satisfied with its value. He had also many times cautioned me against "publis.h.i.+ng" its advantages so widely, without having first protected it by a patent. He was therefore quite ready to come to my a.s.sistance. He helped me with the necessary money, and the invention was placed in a position of safety so far as my interests were concerned. In return for his kindness I stipulated that the reimburs.e.m.e.nt of his loan should be a first charge upon any profits arising from the manufacture of the steam hammer; and also that he should have a share in the profits during the period of the patent rights. Mr. Bennett lived for many years, rejoicing in the results of his kindness to me in the time of my difficulty. I may add that the patent was secured in June 1842, or less than two months after my return from France.

Soon after this, the iron trade recovered from its depression.

The tide of financial prosperity of the Bridgewater Foundry soon set in, and my partner's sanguine confidence in my ability to raise it to the condition of a thriving and prosperous concern was justified in a most substantial manner. In order to make the most effective demonstration of the powers and capabilities of my steam hammer, I constructed one of 30cwt. of hammer block, with a clear four feet range of fall. I soon had it set to work; and its energetic services helped us greatly in our smith and forge work. It was admired by all observers. People came from a distance to see it. Mechanics and ironfounders wondered at the new power which had been born.

The precision and beauty of its action seemed marvellous.

The attendant could, by means of the steam slide-valve lever in his hand, transmit his will to the action of the hammer, and thus think in blows. The machine combined great power with gentleness. The hammer could be made to give so gentle a blow as to crack the end of an egg placed in a wine gla.s.s on the anvil; whilst the next blow would shake the parish or be instantly arrested in its descent midway.*

[footnote...

This is no mere figure of speech. I have heard the tea-cups rattle in the cupboard in my house a quarter of a mile from the place where the hammer was at work. I was afterwards informed that the blows of my great steam hammer at Woolwich a.r.s.enal were sensibly felt at Greenwich Observatory, about two miles distant.

Hand-gear was the original system introduced in working the hammer.

A method of self-acting was afterwards added. In 1843, I admitted steam above the piston, to aid gravitation. This was an important improvement. The self-acting arrangement was eventually done away with, and hand-gear again became all but universal. Sir John Anderson, in his admirable Report on the Vienna Exhibition of 1873, says: The most remarkable features of the Nasmyth hammers were the almost entire abandonment of the old self-acting motion of the early hammers and the subst.i.tution of new devices, and in the use of hand-gear only in all attempts to show off the working. There is no real saving, as a general rule, by the self-acting arrangement, because one attendant is required in either case, and on the other hand there is frequently a positive loss in the effect of the blow. By hand-working, with steam on top of piston, the full force can be more readily maintained until the blow is fully delivered; it is thus more of a dead blow than was formerly the case with the other system."

There was no want of orders when the valuable qualities of the steam hammer came to be seen and experienced. The first Order came from Rushton and Eckersley of Bolton, who, by the way, had seen the first copy of my original design a few years before. The steam hammer I made for them was more powerful than my own. The hammer block was of five tons weight, and had a clear fall of five feet. It gave every satisfaction, and the fame of its performances went abroad amongst the ironworkers. The Lowmoor Ironworks Company followed suit with an order for one of the same size and power; and another came from Hawkes and Co., of Newcastle-upon-Tyne.

One of the most important uses of the steam hammer was in forging anchors. Under the old system, anchors upon the soundness of which the safety of s.h.i.+ps so often depends--were forged upon the "bit by bit"

system. The various pieces of an anchor were welded together, but at the parts where the different pieces of iron were welded together, flaws often occurred; the parts would break off--blades from the stock, or flukes from the blades--and leave the vessel, which relied upon the security of its anchor, at the risk of the winds and the waves. By means of the steam hammer these risks were averted.

The slag was driven out during the hammering process. The anchor was sound throughout because it was welded as a whole.

Those who are technically acquainted with smith work as it used to be practised, by what I term the "bit by bit" system--that is, of building up from many separate parts of iron, afterwards welded together into the required form--can appreciate the vast practical value of the Die method brought into general use by the controllable but immense power of the steam hammer. At a very early period of my employment of the steam hammer, I introduced the system of stamping ma.s.ses of welding hot iron as if it had been clay, and forcing it into suitable moulds or dies placed upon the anvil. This practice had been in use on a small scale in the Birmingham gun trade, The ironwork of firearms was thus stamped into exact form. But, until we possessed the wide range and perfectly controllable powers of the steam hammer, the stamping system was confined to comparatively small portions of forge work. The new power enabled the die and stamp system to be applied to the largest cla.s.s of forge work; and another era in the working of ponderous ma.s.ses of smith and forge work commenced, and has rapidly extended until the present time. Without entering into further details, the steam hammer has advanced the mechanical arts, especially with relation to machinery of the larger cla.s.s, to an extent that is of incalculable importance.

Soon after my steam hammer had exhibited its merits as a powerful and docile agent in percussive force, and shown its applicability to some of the most important branches of iron manufacture, I had the opportunity of securing a patent for it in the United States.

This was through the kind agency of my excellent friend and solicitor, the late George Humphries of Manchester. Mr. Humphries was a native of Philadelphia, and the intimate friend of Samuel Vaughan Merrick, founder of the eminent engineering firm of that city. Through his instrumentality I forwarded to Mr. Merrick all the requisite doc.u.ments to enable a patent to be secured at the United States Patent Office at Was.h.i.+ngton. I transferred the patent to Mr. Merrick in order that it might be worked to our mutual advantage. My invention was thus introduced into America under the most favourable auspices.

The steam hammer soon found its way into the princ.i.p.al ironworks of the country. The admirable straightforward manner in which our American agent conducted the business from first to last will ever command my grateful remembrance.

CHAPTER 14. Travels in France and Italy.

I have already referred to my visit to Creuzot, in France.

I must explain how it was that I was induced to travel abroad.

The French Government had ordered from our firm some powerful machine tools, which were manufactured, delivered, and found to give every satisfaction. Shortly after, I received a letter from M. Bouchier, the Minister of Marine, inviting me to make a personal visit to the French naval a.r.s.enals for the purpose of conferring with the directing officials as to the mechanical equipments of their respective workshops.

I accordingly proceeded to Paris, and was received most cordially by the Minister of Marine. After conferring with him, I was furnished with letters of introduction to the directing officers at Cherbourg, Brest, Rochefort, Indret, and Toulon. While in Paris I visited some of the princ.i.p.al manufacturing establishments, the proprietors of which had done business with our firm. I also visited Arago at the Observatory, and saw his fine array of astronomical instruments.

The magnificent collections of antiquities at the Louvre and Hotel Cluny occupied two days out of the four I spent in Paris; after which I proceeded on my mission. Rouen lay in my way, and I could not fail to stay there and indulge my love for Gothic architecture.

I visited the magnificent Cathedral and the Church of St. Ouen, so exquisite in its beauty, together with the refined Gothic architectural remains scattered about in that interesting and picturesque city. I was delighted beyond measure with all that I saw.

With an eye to business, however, I paid a visit to the works which had been established by the late Joseph Locke in the neighbourhood of Rouen for the supply of locomotives to the Havre, Rouen, and Paris Railway.

The works were then under the direction of Mr. Buddicom.

I went onward through Caen to Bayeux. There I rested for a few hours for the purpose of visiting the superb Norman Cathedral, and also to inspect the celebrated Bayeux tapestry. I saw the needlework of Queen Matilda and her handmaidens, which so graphically commemorates the history of the Norman Conquest. In the evening I reached Cherbourg.

I was cordially received by the directing officer of the dockyard, which is of very large extent and surrounded by fortifications.

My business was with the smithy or atelier des forges, and the workshops or ateliers des machiness. There I recognised many of the machine-tools manufactured at the Bridgewater Foundry, doing excellent work.

My next visit was to Brest, the chief naval a.r.s.enal of France.

It combines a dockyard, a.r.s.enal, and fortress of the first cla.s.s.

Everything has been done to make the place impregnable. The harbour is situated on the north side of one of the finest havens in the world, and is almost land-locked. Around the harbour run quays of great extent, alongside of which the largest s.h.i.+ps can lie--five artificial basins being excavated out of the solid rock. The whole of the harbour is defended by tier above tier of batteries. Foreigners are not permitted to enter the dockyard without special permission; but as I was armed with my letter of introduction from the Minister of Marine, I was admitted and cordially received, as at Cherbourg. I went through the Government foundry and steam-factory, for which I had supplied many of my machine tools. I found the establishment to be the largest and most complete that I had seen. From Brest I went to Rochefort, an excellent naval a.r.s.enal, though much smaller than those at Cherbourg and Brest. Next to Indret on the Loire. Here is the large factory where marine engines are made for the royal steamers.

The works were superintended by M. Rosine, a most able man.*

[footnote...

The only man I ever met, to whom I might compare Rosine, was my lamented friend Francis Humphries, engineer of the Great Western Steams.h.i.+p Company. Both were men of the same type, though Rosine was several octaves-higher in the compa.s.s and vividness of his intellect.