High Volume Releases at Golden Falls Dam

Golden Falls dam, Ballymore Eustace. © Eugene Brennan

According to the ESB, a flow rate of 15 m³/s (cubic metres per second) is estimated for today, 13th November, from 00:00 to 24:00. That's 15 tonnes of water per second. The compensatory/buffer lake at Ballymore Eustace has risen by 9 m since 14th October. The lake acts as a buffer to cater for larger releases at the Poulaphouca dam. I'm guessing some of this water may be through the sluice gates and over the spillways, if the water has reached "overflow" level, rather than through the penstock (a large diameter pipe) feeding the alternator. I've put in a query to the ESB, requesting answers to some technical questions.

The Golden Falls hydroelectric power station has a single three-phase alternator that generates 4 MW of electrical power. For comparison, onshore windmills typically output 2 to 3.5 MW.

How to Lubricate a Bicycle Chain With Candle Wax

Waxing a chain. © Eugene Brennan

Instead of oil, I've been using church candle wax for lubricating my bike chain over the last year. They were throwing out the waste-ends of candles from the church and they were given to my mother, possibly because she knew I was making candles at the time. That's probably almost 20 years ago. I was experimenting with using PVC waste pipe as moulds for casting the candles. Anyway the process of chain waxing is somewhat tedious, but worth it. Before dipping in wax, I rinse the chain five times in kerosene to remove all grime and then the final rinse is in methylated spirits to remove kerosene.

Chain washing kerosene. © Eugene Brennan 

 

Washing the chain in kerosene. © Eugene Brennan

 

The next stage is to dip the chain in hot wax, melted for safety reasons in a double boiler. This ensures that the wax can never reach more than 100 degrees Celsius, well below its autoignition temperature.

Chain waxing has to be done every 200 to 300 miles. However, this makes the chain nice and clean to the touch, and grit from the road doesn't stick to it and wear it away. So far, I've got 1200 miles out of a chain with waxing and there's minimal wear (I'm nerdily logging the data on a spreadsheet), This isn't much by road bike standards (it's on my MTB), but I was getting less than 1000 miles I think before because of all the grit that stuck to the oil and rapidly wore the chain.

 

Double boiler for melting wax safely. © Eugene Brennan

Melting candles. © Eugene Brennan

Golden Falls Generator Assembly

Golden Falls G 4 assembly. Main shaft guide bearing and oil pump. July 1948. 

Permission to reproduce image courtesy ESB Archives.

 © ESB Archives

ESB Archives have sent me some photos, dating from the 1940s, of the electrical generating equipment in the Golden Falls hydroelectric power station. The stator assembly of the generator can be seen around the perimeter of the casing in two of the photos. Similar to the alternator in your car, a rotor carrying field coils, driven by a shaft from the turbine, turns within the outer stator. The field coils are excited by DC to create a magnetic field and three-phase AC is drawn off the stator. (The same thing happens in a car alternator, but the three-phase AC at a frequency of several hundred hertz is rectified to DC. Older cars used dynamos, that produced DC directly, but suffered from several drawbacks).

Anyone Got a Good Nose?

 Image courtesy Google Maps.

The smell that was present last year, adjacent to the entrance to Kilcullen Business Campus, has returned. It might be gas or sewage, I'm not sure. It could be sewer gas released from a vent.
There's a mark on the road surface, extending from one side of the road to the other, where it was re-tarmacked after a service was laid. So that may be where the gas or sewer line runs under the road. The smell is coming from the area where this service enters the business campus, behind the timber fence to the right of the main gate.
My sense of smell has deteriorated because of COVID, so maybe someone could confirm if the can smell anything?

I'll have a look at the Gas Networks Ireland map to see where the gas line enters the site. I rang either John Craddock Ltd or Murphy Geospatial last year, can't remember which, to enquire whether there's a management company for the business campus. But I was told there isn't.

Is it council owned?

Another possibility is that there's a sump (a holding tank, that acts as a reservoir for sewage until the sewers can take it) near the entrance and this has a vent that releases sewer gas, just like a septic tank.

Gas Turbine Engines

Types of gas turbine engines. Created by ChatGPT.

Gas turbine engines are used in many applications, not just on aircraft. They power ships, tanks, helicopters and they're also sometimes used in power stations to drive alternators (AC generators) for generating electrical power. Gas turbine engines have been used to power trains in the 50s and 60s, e.g. the Union Pacific GTEL locomotive. A "jet engine" is a specific type of gas turbine engine where a jet is used to provide thrust. The jet can provide thrust directly (turbojet) or power a fan (turbofan engine) or propeller (turboprop). The advantage of a gas turbine engine is its high efficiency when scaled up and run at high power. At small scales (if they were used to power cars) they would be less efficient than a piston engine. Gas turbine engines also have a high power to weight ratio compared to a piston engine.
Thanks to ChatGPT for drawing a graphic for me. 

Nice New Wheels Delivered!

Sealed bearing wheels. © Eugene Brennan

It took me forever last week to source these. The engineering aspect and excuse to post about them is that they have sealed ball bearings, so somewhat better than the cup and cone bearings used in traditional mountain bike wheels. The latter are a pain in the arse to maintain and water gets into the ones on the back wheel when hosing the sprockets after they get covered with muck. So they have to be dismantled, cleaned and degreased (see photo below). Several local bike shops hadn't heard of these wheels or said they didn't exist. Anyway 360cycles.ie will be getting a good review because they were really helpful and gave lots of updates on the progress of sourcing them for me.

Sealed bearing image public domain, courtesy 4volvos.

Components of a rear cup and cone bearing. © Eugene Brennan

Clock Drive Rotor

Wall-clock rotor (approximately 8 mm long). © Eugene Brennan

The mechanism (also called the movement) or working parts in a quartz battery clock is a bit simpler than in a traditional wind-up clock.

At the heart of the clock is a quartz oscillator, which generates a pulse every second. An oscillator is a device that does something regularly, like a pendulum that swings back and forth, a tuning fork vibrating, a string on a guitar or the air in an organ pipe. All these are mechanical oscillators, but there are also electronic oscillators.

An electronic oscillator generates a voltage signal that repeats itself at a set frequency. In the case of the oscillator in a clock, this runs at several thousand hertz or cycles per second. An electronic component called a quartz crystal sets the frequency of the oscillator to about 32,768 Hz with a high degree of accuracy. The frequency is divided down and reduced so that it eventually becomes 1Hz or 1 cycle per second. The output of the oscillator drives an electromagnet that acts on a tiny magnetic rotor, flipping it half a turn every second. The rotor has gear teeth that mesh with a train of other gear wheels and this eventually turns the hands of the clock.

Quartz clock mechanism. © Eugene Brennan

A closer look. © Eugene Brennan

Technology Tedium

AI image generated by Grok.

A guy I was in school with was typing in the code for a game and after spending ages at it, his kid brother pulled the plug on the computer before he had it saved to cassette. I don't even think of saving work now until I'm completely finished, although I should, in case there's a glitch. When a laptop is put to sleep, everything resumes when it's woken up again. And we have undo buttons in applications for reversing anything we've done. Many applications that ran on MSDOS, before Windows, didn't have an undo button. So if you were typing a document or drawing something, you had to save to file before you made any major changes so you could reload and get back to a version before the change.

Extinct Infrastructure in Kilcullen

Image courtesy Google Maps.

I've always been fascinated by infrastructure and utilities such as electrical and plumbing systems. When we were in senior infants, I remember Richard Brophy, a classmate, and I lifting manhole covers in the yard of the old girls' school, which is now the parish centre. Maybe this was one of our chores to make sure the drains weren't blocked or else we were just curious. In any case, the nuns would have been hidden away in their "hut" at lunch time, unaware of what we were up to. Hosing out the toilet block in the old boys' school, which wasn't much cleaner than a cow shed, would be a weekly chore in years to come. A more pleasant job in 6th class was being sent around all the classrooms to collect the contents of the waste paper baskets and then lighting a huge bonfire against the wall of the briquette shed— all unsupervised, but great fun. I wondered as a child about the object shown in the photos above. In the early 70s, it was a green, cast-iron pipe, sticking out of the ground, possibly with a certain amount of decorative detail. In modern times, infrastructural components such as lamp posts tend to be purely functional, but in the past, they were often ornately designed — for example some of the poles that once carried Dublin's overhead tram wires have now been repurposed as lamp posts. The pipe in the photos was still extant in 2009 and covered in ivy, but disappeared when the boundary wall of CPC was rebuilt. It was presumably a sewage vent, which became unnecessary for a reason I'm unsure of. Vents like this are used in domestic plumbing systems to allow air into sewerage systems to prevent water from being siphoned out of S and P-traps and to allow wastewater to flow freely.

Megalithic Mound or Natural Glacial Deposit?

Image courtesy Google Maps

I've often wondered about this area of raised ground and whether it's a megalithic feature. The ground rises gently on all sides, but the high ground isn't overly symmetric like other man-made megalithic sites in the landscape. It doesn't appear in any archaeological records. As kids, when we were looking for the legendary tunnel that ran from New Abbey to the Valley Park, I remember investigating a hole in the slope of the mound, lined with stones. Maybe it was the remains of a well? Does anyone remember this?

Erosion and Deposition

AI image generated by Grok Imagine.

The geometry of a conduit through which any fluid passes affects the velocity profile of that fluid. In the case of a river, on the inside of a bend, water flows slower. On the outside of the bend, water flows faster. Erosion due to faster flow causing a scouring effect is probably responsible for the so-called "Sally Hole" in the riverbed near St Brigid's Well. Eventually there may be landslides as the riverbank is undercut. However, tree roots and other vegetation act as reinforcement, holding the bank together. So it's not necessarily imminent. Meanwhile, on the meander opposite Castlemartin, debris such as bottles and other rubbish accumulate on the inside bend, where water flows slower. Water also flows faster where there's a bottleneck in a watercourse. (You can observe this from the farm trail near the island that's north of the bridge. However, this may be partially due to a gradient in the river bed).
Bernoulli's principle is a law in fluid dynamics which states that an increase in speed occurs simultaneously with a decrease in pressure. It's a principle that's used in engine carburettors. A venturi (a narrowing of the passage in a carburettor through which the fuel/air mixture flows) causes a drop in pressure. That drop in pressure causes fuel to be sucked into the venturi. Small engines such as those used on lawn mowers still use this arrangement for supplying the engine with a fuel/air mixture. However, modern petrol engines on vehicles use fuel injection. (Since the late 1980s, early 1990s I believe).

Slippery Manhole Covers

Image courtesy Google Street View

I don't want to be ranting on about them all the time and get a reputation as a manhole crank, but there's a really slippery one outside the heritage centre. I slipped on it on Friday when out running. I wasn't running at the time, but just stepped in off the road after stepping off the kerb to avoid some pedestrians and maybe turned too quickly on the cover. My foot went from under me on the surface and I wrenched my shoulder, throwing myself forwards to avoid falling backwards. It had to be the bad shoulder I damaged eight months ago after falling when sprinting. Anyway, I think the problem with these galvanised manhole covers (Eir ones) is that the bumps/tread pattern they put on them for grip is too rounded and shallow, unlike the square bumps on the older cast iron covers. They're probably polished from foot traffic also.

Edit: I think it's an Eir one, but maybe ESB Networks.

Pump House, County Board of Health

Last edition 6" map. Image courtesy Tailte Éireann.

This was a small hut, from what I can remember, with a slate or corrugated-iron roof, located in the council yard beside the old canoe club building (a "Barna Building"-style timber hut). There was a good view of it from the playing field of the BNS (now the library building) from where we used to throw stones and see if we could get them into the river. I presume the function of the pump was to pump water from the Ballymore Eustace water treatment works to a reservoir on raised ground at the back of Dunlea's garage, before the cavernous underground reservoir was built at Old Kilcullen.

Kilcullen Mill Stream Rerouted

Mill stream, Kilcullen. Image courtesy Tailte Éireann.

I'm always trying to spot things I've missed on the Ordnance Survey Ireland (now Tailte Éireann) historical maps. One thing I hadn't noticed previously was that the mill stream was rerouted, sometime after 1939. The first image is a satellite photo and the next three, from top to bottom are the c. 1837 6" first edition map., the c. 1900 25" map and the last edition 6" map (which is post-1939, since the Nicholastown housing estate has been built, but pre-1950 because the Logstown estate hasn't been built yet).

On the last edition map, the area around the mill stream is marked as "liable to floods". I'm guessing the meander was removed from the stream and water routed through a deeper channel directly to the river to prevent flooding. (The channel could have been widened also). The original stream bed can be faintly made out in the satellite photo.

Maybe some older locals would know something about this?

 

The Irish Townland and Historical Maps Viewer can be accessed here:

 

https://osi.maps.arcgis.com/apps/webappviewer/index.html...

 

Images courtesy Tailte Éireann.

 

c. 1837 6" first edition map. Images courtesy Tailte Éireann.

c. 1900 25" map. Image courtesy Tailte Éireann.

Last edition 6" map. Image courtesy Tailte Éireann.

Install Lighting at the Recycling Facility at Leinster Marts

Created with Grok Imagine

Just an idea so we don't end up stepping on broken-bottle ends at night, which I've seen every so often. I usually bring a torch, but safety shoes with steel insoles would be advised. Getting ESB Networks to install an electrical supply for lighting always seems to be a hassle and costly, as we saw recently when a pedestrian crossing was installed, so maybe lights could be solar powered and on sensors? They'd only need to turn on intermittently, so average power use would be low and therefore solar panels for powering the system wouldn't have to be large. In fact, a sensor could be mounted on the nearest light to the gate to control a string of maybe three streetlamps.

Edit: Grok made the image, so send the Grammar Police to them if you're concerned about spelling.

Bad Water Quality In Kilcullen

AI image created by Grok for illustrative purposes.

Am I the only one who is experiencing corrosion of aluminium fittings because of the excessive lime in the water? Lime builds up in lumps, these act as sponges, holding water in contact with metal. Chlorine in water can make it acidic or alkaline and fluorine in the water also makes it acidic. The result is pitting damage on for example the frame members of showers.
Maybe it's time to lobby Uisce Éireann again? They say water quality is to recommended standards, but I have my doubts. It may be safe to drink, but it's obviously causing problems. Have there been any changes at the water treatment plant at Srowland, Athy to improve water quality since this article in the Kilcullen Diary in 2022?

Saw Setting and Yield Strength

© Eugene Brennan

 

My bow saw blade is years old. I've cut up loads of logs and full trees with it and I sharpen it every so often (an extremely boring and tedious job, because there's probably over a hundred edges to do.) However, it was binding, because I reckoned, the faces of the teeth were worn and there was no kerf remaining. The teeth of a saw blade are alternately set to the left and right, so that they point slightly away from the blade. This gives the saw a kerf, making the width of the cut wider than the body of the blade behind the teeth so the blade doesn't bind. Without a kerf, a blade would stick in damp timber. I used a saw set tool on the blade (one of several old hand tools belonging to my grandfather) and it's working beautifully now, no problem cutting logs up to 5" thick. (Handier than taking out the chainsaw and good for upper body exercise.)

I tried using a saw set on a carpenter's hand saw once and it broke one of the teeth. So I'm wondering can only some modern saws/saw blades be used with a saw set because the teeth are so hard and the ultimate strength of the steel isn't much higher than the yield strength. I.e. once the elastic limit is reached, teeth don't deform plastically and just break? The engineering aspect of this post is that materials have a yield strength which is the max strain they can undergo elastically without permanent deformation. After that they deform plastically and don't spring back into shape. The ultimate strength, measured in units of newtons per square metre or pascals (a pressure measurement) is the point at which a material will fracture.

Parish Centre Windows and Lawn Mower Decks

A counterbalance used to balance a lever. These are often seen on road barriers where one end of the lever is much shorter than the other end. © Eugene Brennan

Standing at the side of the parish church this morning, collecting for the SVP, I noticed the parish centre still has sash windows. I’m not sure whether these are the original ones; I would have thought they’d have rotted away by now. So maybe some or all of them are timber replacements. As six-year-olds in Sr Brendan's senior infants or "high infants" as we called it, one of the chores that was sought after was being allowed to sweep the leaves on the lane up to the playing field, where the Millstream Court houses are now located. The other was being given the job of opening or closing the sash windows in the classroom. In our young minds, either of these tasks gave us a sense of being very important people.

ESB Networks Account

Generated using Bing Image Creator

Did you know, you can register for an ESB Networks account that allows you to access lots of information about the electricity usage logged by your smart meter, irrespective of which supplier you're with? The details are more comprehensive than those provided by electricity providers. Also, meter readings are shown and it's possible to download a comma separated values (CSV) file that contains meter readings which can be read by spreadsheet software such as Excel. Time and date-stamped daily readings are provided, with a precision of two decimal places. I switched to SSE Airtricity recently and was annoyed to discover that their bills don't show meter readings, just usage. So there's no way to double check whether the figure they quote tallies with meter readings.

Artemis II On Schedule

Artemis II crew. Image credit: NASA/Kim Shiflett

The Artemis I mission, launched in 2022, involved sending an uncrewed Orion spacecraft into orbit around the Moon and bringing it back to Earth. Artemis II will be a crewed mission, launching four astronauts into a free-return orbit around the Moon and back to Earth, the first time humans will have been in lunar orbit since 1972. The mission had been delayed until September 2026 due to technical problems, but has now been brought forward to April of next year or possibly earlier. NASA's Orion spacecraft comprising of a command and service module sits on top of the unimaginatively-named Space Launch System (SLS), the equivalent of the Saturn V rocket used for the Apollo program. The 8.4 m (27.6 ft) diameter, 98 m (322 ft) tall SLS is a two-and-a-half-stage rocket, powered by engines that burn liquid hydrogen and liquid oxygen, assisted by two solid rocket boosters.