We continue our serialisation of the memories of Merthyr in the 1830’s by an un-named correspondent to the Merthyr Express, courtesy of Michael Donovan.
The men were from the Atlas Works (Sharp, Roberts & Co). Richard Roberts had previously been at Dowlais, and Lady Charlotte, in showing him around, took him into the church, where he remarked what a splendid fitting shop it would be.
The No 5 blast engine was, at the time of its erection, the largest ever made, and it had two steam cylinders – after the Hornblower or Woolf type, and to get all the valves to work properly, was then thought difficult – in fact, they did not work as well as desirable. Amongst the persons had for consultation was Mr Brunton from Hornsley. He it was that first brought the application of a fan for the ventilation of collieries into notice, I can recall his models and explanation. It was not readily adopted. Furnaces were very simple, and there was not much thought of economy of coal, but the furnace was dangerous. This was palliated by means of a dumb drift, but as far as I know, no colliery of any size uses a furnace for its ventilation.
Simple and efficient as the arrangement was for letting persons know the boiler was short of water it was not quite as perfect as the following will show.
Mr John Evans, on looking at the boilers of the furnace at the Ivor works, when everything was in full work, noticed the whistles (that is the only thing visible thing in the arrangement for making a noise if feed was low) were all covered, and speaking to the attendant, found he had designedly wrapped some ‘gasket’ around to prevent noise. With some cause Mr Evans was in a passion, so he ordered the man off at a moment’s notice, and sent for the writer, telling him to get the feed right. There were four boilers, and every one was in low water. The engine was doing its full work, and therefore taking steam; the fireman was firing as hard as usual to supply the necessary steam, but no water was going into the boilers to form the steam.
On examination, I found the bottom valve of the feed pump was deranged, and the anxiety and fear I experienced can be recalled now. Mr Evans, as soon as he told me, went off to the old works to send an attendant thence, but was more than an hour before he came, and in the interim, having got the valve right, the boilers were being replenished. Even then, however, danger was not over, for cold water going upon hot plates is apt to get into the molecular condition, and instead of taking up heat quietly, and get into a kind of bubble then explode. Boutigny has since done much to exemplify it, and in his work on “Heat a mode of motion”, Tyndall has fully explained it, but at that time neither had been heard of. The fact was known, but ascribed to another cause.
However, to my great relief, everything passed off safely, and without derangement of working. More than once I inclined to stop the engine. This would naturally draw all the furnace men about me, when it was likely that the imminence of danger would have caused all to get as far away and as quickly as ever they could. The experience of that hour has, however, never been forgotten.
To be continued at a later date…..