Need modern example to compare against

What is needed is the something that does the same thing, expressed in modern terms. The problem with that is it might take just as long to build under Windows, and will probably have bugs and/or a virus.

Hats off the the original designer!

There ought to be more such replicas

"it does seem a bit extreme, no matter how much money you have to commission one"

I disagree. In this age of mediocrity, we need more inspiration from people such as Babbage so that future generations might again aspire to proper preparation and planning before doing, versus hacking away without any plan as is the way of our time.

The common wisdom almost all software developers subscribe to these days is that software cannot possibly be bug free so one might as well not bother to even try keeping bugs out of the design, one should instead get one's work completed first and then remove the errors over time. This mentality has since spread into other areas of technology as well.

This is in total contrast to how people in earlier times worked. They felt that it was worth while trying to come up with a perfect design and then execute as close to the ideal as possible. Back then, there was absolutely no appreciation for our modern notion of "fix it later". Anybody who would have shown a "fix it later" attitude was automatically identified as a charlatan.

The work of Babbage, and by extension replicas of the machines he designed are a reminder to us what we can achieve if only we put our minds to it. Therefore, I say, one replica of a Babbage machine in a museum where it can inspire future generations of engineers and scientists is likely to do more good than a million copies of Windows donated for education.

19th century engineering

When they building the device, there were a number of articles that made the comment that 19th century engineering couldn't produce the device - not true. There were numerous examples of other devices that were created to the same or better levels of tolerances. the manufacturing processes of the day were more than capable of building it.

The main problem was the government of the day; my understanding is that they originally offered money to develop the device, then changed their minds about what they wanted it to do. After modifying the designs, they then changed their minds again, and again and........ eventually, they just withdrew the funding.

Plus ca change?

Beat this Lego photographing vultures...

http://acarol.woz.org/

If he had built it...

I wonder how long it would have taken for someone to work out how to use it for P0rnz?

Very cool though.

One per desk..........

That thing is stupidly huge, I know they went from the plans but surely they could have built it half or quarter sized with modern materials.

How long now before somewhere in china see's these as popular and builds them keyring sized for a $

I hope they do, I'd have one lol

Beautiful!

This is just brilliant. I love it. Babbage, Brunel and several other genial engineers and scientists continue to amaze today, especially taking into account the basic technology that was available back then, and that some of the work was done with calculations, measurements, and staking their reputations on their work.

My hat off to Charles Babbage.

@ Ashley

"If only Charles Babbage had stressed the military applications of his machine"

I believe he did - the plan was to produce exactly the types of tables for use by Army & Naval artillery that you suggested. I can't remember what the reason given was, but apparantly, the LOTA decided it wasn't for them.

I note that by the early 1900's when the Dreadnoughts were being built, Jackie Fisher, then First Sea Lord was appalled by the performance of naval gunnery - less than 10% accuracy. A hundred years earlier, the 32 pounder (firing round shot from an unrifled barrel) could hit a 3 yard target at a distance of 3 miles 90% of the time.

If I'm not mistaken, the original plan for the colossii built at Bletchly Park were to produce similar tables - that was also rejected by the military.

As I say, plus ca change.

Nobody has mentioned

That part of what scuppered Babbage's plans was that he was a miserable old git. He regularly fell out with workmen, and complained about street performers making too much noise for him to concentrate. The former is part of what kept the DE from being built, the latter led to laws about playing music in the street. Next time you see a busker getting a ticking off from the plod, spare a thought for Charles Babbage and the organ grinders that plagued him.

Royal Navy would have loved a device that could churn out ...

Ah! - but I'm old enough to remember the RN de-commissioning a device that must have been inspired by Babbage (analytical probably) - it was used for calculating tide tables, and was replaced in the 1960's with the biggest offering available from Big Blue, except that it wasn't quite as accurate. The analog device had been running since the mid to late 19th century and had been upgraded once in the 1930's when the hand crank was replaced by an electric motor.

AndyD 8-)#

Beautiful indeed!

The CRAY I has just been bumped down from my list of favorite computers ever, as I get swept off my feet by the mechanical beauty of this contraption. Fascinating!

The original steam punk indeed. Charles Babbage was a genius and an artist.

-dZ.

Built

If I understand _Passages from the Life of a Philosopher_ correctly, difference engines built based on description of Babbage's plans were completed. One built by a Swede ended up at the Dudley Observatory in Albany, NY; a copy of this machine was used at the Registrar General's office in London.

@HFoster: Babbage certainly was an early & ardent perpetrator of scope creep. And his battles with street musicians make for interesting reading.

@Tony: I wonder about your numbers for 32-pounder accuracy for the early 1800s. Most of the butchery seemed to be done at very close quarters.

uninspired machinists

My understanding was the Royal Navy wanted machine-perfect trig tables for navigation, as there are several clusters of wrecks partially attributable to faulty tables. Babbage had a hand in not getting the thing built, doing a bait-and-switch on his even-more-ambitious analytical engine. It was a classic defense procurement fustercluck.

Is anyone else dissappointed by the raw 21st century austerity of the replica? In the 19th century, the gears would have been cast, with elegant spokes and a pebble finish, machined only on the working surfaces. It would have *looked* victorian. In replicating the function, I think the fabricators missed out on replicating the feeling of the piece. The replica looks big and fiddly, but it isn't *pretty*, as it probably would have been.

The whole thing's a metaphor. A microsoft exec wants the thing enough to pay a million dollars for it, and wants it in his living room, and it works, but it's got no soul. Sigh.

@ jonathon

Sorry, this one wasn't from a web site, but an old history book. The 32 pounder was a very effective weapon and was the main stay of the ship of the line from the late 1700's. I imagine the tests done were from a ship at anchor with spring lines to stabilise it although I can't say for certain.

However, you are also correct in saying that a lot of fighting was done at much closer range; hence Nelson's comment that "no captain can do very wrong if he lay his ship along side that of the enemy". In many cases they were just blasting away until someone had had enough - and the descriptions of the fighting and the devastation afterwards are truly horrific - it makes some of the modern slash movies look like the teletubbies.

Note also that the limit of a country's jurisdiction around the coast was established by how far away a ship could sail without being pounded to bits by a shore based battery.

One per desktop (et al)

The reason it is the size it is: the range in sizes of the various parts meant that for the smallest to be strong enough (great enough cross-section), the largest are, well, the size they are. It is possible that a 1/4-scale model could be built today, using today's materials, today's fabrication processes, and designed with today's clustered supercomputers running FEA software. However, the _point_ of the original exercise was to determine if _Babbage_ could have built it, with the materials and processes available at the time.

As to "It's a computer, just look at it", well, then EMERAC is a computer :-)

(NOT! Nor is this)

As to the "Swede" who built a difference engine, that one lacked many of the error-checking facilities of Babbage's and was as a result a bit "fiddly", IIRC.

As to crank effort: the current machine has a 4:1 reduction gear. It takes a bit of patience, "feel", or whatever to turn, but I have done so and I am no giant. It would be tiring to turn it at 1:1, and more prone to jams (error-detecting, again), because of the variance in load during the machine cycle, but IMHO, not out of the question. You perhaps underestimate the strength, stamina, and flexibility of the typical Victorian Navvy. :-)