Showing posts with label computation. Show all posts
Showing posts with label computation. Show all posts

Photographer's Slide Rule

Saturday, September 17, 2016 0 comments

Before there were lightmeters...

Another interesting Nomographic device.

Like the Airship Engineer's Slide rule I discussed previously, other technically complex disciplines made use of nomographic devices to simplify on the fly calculations.

Photographers developed devices for determining exposure times known as Actinographs.

The name originally meant a device that recorded the amount of sunlight for a day but was adopted for the photographer's slide rule that used that data.

Here is an example from the later 19th C

Since the exposure time depended on several factors these could be set by sliding the scales. The scales were adjusted to account for plate speed, lens type, and other variables.  The curves on the roller indicated the changing light intensity for different times of the year.  The result was an estimate of the exposure time needed.

Here is another Actinograph that used a card instead of a roller for the sunlight data.
This is one of the first commercially produced devices made by Ferdinand Hurter and Vero Charles Driffield and patented in 1888.



Keep your sightglass full, your firebox trimmed and your water iced.
KJ

Airship Engineer's Slide Rule

Tuesday, March 1, 2016 0 comments

Slip Sticks for the Black gang!

Previously I posted about Nomography, i.e. the use of graphical tools for solving equations.

I have found a perfect example in the Internet Archives!
This article AN AIRSHIP SLIDE RULE By E. R. Weaver and S. F. Pickering, details the calculations and construction of a slide rule for working out problems concerning buoyancy, volumes, temperatures, lifting capability, and altitudes. Specifically for Airship crews this simple device is perfect for the analysis that any Flight Engineer would need to do as part of his duties.

The pamphlet contains the mathematical derivations for the scales and lots of sample problems that can be worked out using the slide rule.

Here is a picture of the slide rule:


And here is a page with some examples of the kinds of problems that could be worked out:


A very useful tool indeed.

Since this pamphlet includes the formulas for how the scales used on the slide rule are laid out, it should be possible to build one!

I think my Flight Engineer needs one, but adjusted for Steam as the lifting gas.

Keep your sightglass full, your firebox trimmed and your water iced.
KJ

Time keeping by Nomography

Sunday, January 31, 2016 0 comments

Let the Sun shine in!

Last time I presented a link to the fascinating world of graphical calculations known as Nomography.

Now in Steampunk there is an emphasis on the mechanical. Time keeping being probably the greatest illustration of this. From tiny mechanical watches to massive clockwork calculating machines the imagery of gears and clocks are everywhere. But there are older ways of measuring time, using the motion of the Earth and the apparent motion of the Sun and other heavenly bodies with sundials and sextants, astrolabes etc.

This paper has some exotic patterns and calculations for devices that would make wonderful additions to our gadgets: 

Regiomontanus, Apian and Capuchin Sundials by Fer J. de Vries, Mac Oglesby,William S. Maddux and Warren Thom

So how would using this old "primitive" technology be used in Steampunk?

Perhaps hidden in our Mad Scientist's notebooks, or printed on our clothing, buried in the shapes on our gadgets, or or on the covers of our children's beds.  The mathematics used in creating these designs and the decorative possibilities of the shapes and patterns, while actually being usable to tell time, would make for some interesting hidden "conceits" don't you think?

Here is an actual card sundial from 1533.
Yes this is "primitive" in the sense that it is not mechanically complex but there is an elegance of form to the curves and shapes.

Elegant AND functional, scientific and technical, the Steampunk aesthetic on display indeed.

Keep your sightglass full, your firebox trimmed, and your water iced.
KJ

Graphical calculations

Sunday, September 6, 2015 0 comments

Graphs, straight edges, and math oh my!

An interesting "Pie in the Sky Project"

Back in the days before the availability of ubiquitous computing capabilities complex mathematical relationships and rules of thumb were often calculated using graphical computations known as Nomograms or Abacs.

These graphs were laid out in a way that using a straightedge one could determine the result of often complex multi-variable calculations. They were used in everything from engineering and navigation to accounting. They were also used in business and government where there was only a vague mathematical relationship between inputs.

This one for example, is used for "quantitative risk assessment of food to guide sampling/analysis for the purposes of official control of food and to support the enforcement of food safety/consumer protection law."


 

This series of posts by Ron Doerfler describes the process by which such graphs are generated:
http://myreckonings.com/…/the-art-of-nomography-i-geometri…/



So what is the Pie in the Sky Project here?

  • Why not create our own Steampunk Nomograms?
  • What kind of Nomograms would our Steampunk Mad Scientists use?
  • Would they be complex and arcanely illuminated or simple and elegant?
  • Would they be kept in massive bound books chained in our laboratories or kept in our pockets in miniature books with fold out pages?
  • Would they have pockets in the covers to hold exotic curves and circular slide rules or would they have a simple straightedge that would also work as a bookmark.
  • What kinds or equations and nomograms would a Dr Frankenstein use?
  • What about an Airship Engineer? 
  • What would the Abac book of an Aetherwave operator look like?

Keep your sightglass full, your firebox trimmed and your water iced.
KJ

P.S. This book from 1918 has an amazing amount of info and examples of interesting nomograms. The math isn't too bad but it does need some concentration to follow :-)
Graphical and Mechanical Computation


P.P.S Lots of good Nomography tools and some interesting examples here:
Society for the Conservation and Advancement of Nomography

Ada Countess Lovelace, Charles Babbage and...

Friday, February 27, 2015 0 comments

The wondrous machine that might have changed the world!

In the Airship Technology Speech I gave back in January at the Absinthe Cafe the place where our Role Playing World separated from the real world was when Babbage's Analytical engine was actually constructed and working in 1880.

This world changing event was due to the work of Augusta Ada  King, Countess Lovelace.
In the real world Ada died in November of 1852 before Charles Babbage had perfected his design. In our alternate world she outlived Babbage and was responsible for making his designs work, under contract to the Royal Navy for whom Babbage was working as well.


The Honerable Augusta Ada Byron was the only legitimate daughter of Lord Byron. She married Baron William King in 1835 and when he became the Earl of Lovelace in 1838 she became a countess. Her fascination with mathematics and science as well as what she called "poetical science", describing herself as an "Analyst (& Metaphysician)",brought her into contact with Charles Babbage.

Of her work with Babbage on his Analytical Engine she said:
[The Analytical Engine] might act upon other things besides number, were objects found whose mutual fundamental relations could be expressed by those of the abstract science of operations, and which should be also susceptible of adaptations to the action of the operating notation and mechanism of the engine...
Supposing, for instance, that the fundamental relations of pitched sounds in the science of harmony and of musical composition were susceptible of such expression and adaptations, the engine might compose elaborate and scientific pieces of music of any degree of complexity or extent.
 

You can read more details of the Countess' work with Charles Babbage on her Wikipedia page.


From the Wikipedia article:

During a nine-month period in 1842–43, Ada translated Italian mathematician Luigi Menabrea's memoir on Babbage's newest proposed machine, the Analytical Engine. With the article, she appended a set of notes. Explaining the Analytical Engine's function was a difficult task, as even other scientists did not really grasp the concept and the British establishment was uninterested in it. Ada's notes even had to explain how the Engine differed from the original Difference Engine. Her work was well received at the time; scientist Michael Faraday described himself as a supporter of her writing.

The notes are longer than the memoir itself and include (in Section G), in complete detail, a method for calculating a sequence of Bernoulli numbers with the Engine, which would have run correctly had the Analytical Engine been built (only his Difference Engine has been built, completed in London in 2002). Based on this work, Lovelace is now widely considered the first computer programmer and her method is recognised as the world's first computer program.


The Countess's translation of Menabrea's memoir and her detailed comments are available at Fourmilabs here:

Sketch of
The Analytical Engine
Invented by Charles Babbage

By L. F. MENABREA
of Turin, Officer of the Military Engineers

from the Bibliothèque Universelle de Genève, October, 1842, No. 82
With notes upon the Memoir by the Translator
ADA AUGUSTA, COUNTESS OF LOVELACE

A truly fascinating look into what could have been a major turning point in world history.

As the author of the Fourmilab web page says:

“Sketch of the Analytical Engine” by L. F. Menabrea, translated and with extensive commentary by Ada Augusta, Countess of Lovelace. This 1842 document is the definitive exposition of the Analytical Engine, which described many aspects of computer architecture and programming more than a hundred years before they were “discovered” in the twentieth century. If you have ever doubted, even for a nanosecond, that Lady Ada was, indeed, the First Hacker, perusal of this document will demonstrate her primacy beyond a shadow of a doubt. 

Indeed!


Keep your sightglass full, your firebox trimmed and your water iced.
KJ

P.S.
A fun bit of information given how the Countess' contributions to mechanical computation were fundamental to the development of the fantastic airship we use in our Role Play check this out from her Wikipedia page:

Ada was often ill, beginning in early childhood. At the age of eight, she experienced headaches that obscured her vision. In June 1829, she was paralyzed after a bout of measles. She was subjected to continuous bed rest for nearly a year, which may have extended her period of disability. By 1831, she was able to walk with crutches. Despite being ill Ada developed her mathematical and technological skills. At age 12, this future "Lady Fairy", as Charles Babbage affectionately called her, decided she wanted to fly. Ada went about the project methodically, thoughtfully, with imagination and passion. Her first step in February 1828, was to construct wings. She investigated different material and sizes. She considered various materials for the wings; paper, oilsilk, wires and feathers. She examined the anatomy of birds to determine the right proportion between the wings and the body. She decided to write a book Flyology illustrating, with plates, some of her findings. She decided what equipment she would need, for example, a compass, to "cut across the country by the most direct road", so that she could surmount mountains, rivers and valleys. Her final step was to integrate steam with the "art of flying".
Oh if only the Real World had been less cruel.

Beauty in Gears

Sunday, August 25, 2013 0 comments

There is a intriguing beauty in clockwork.

These images by photographer Guido Mocafico show the elegance and beauty of these amazing high end watches.  The photographs are collected in his book Movement.

This is from one of the reviews on Amazon:

The first paragraph in this book reads: "This is a book of photographs. The photographs in this book all show watch movements, but it is not a book about watches."

That is undoubtedly true. This is not a book about watches, it is a book solely about the beauty of high grade, contemporary wristwatch movements. The Italian photographer Guido Mocafico, together with the German design team of Steidl Publishers, and with the technical advice of Swiss watchmaker Antoine Simonin, has created one of the most extraordinary `watch books' I have ever seen.

The team selected 37 contemporary wristwatch movements, and took amazing, full movement photographs of them (sometimes the under dial view, sometimes the back of the movement). The core of the book consists of these 37 very large, incredibly detailed pictures. They are each reproduced on a double page, in 12 inch diameter vivid color images of stunning clarity and depth of focus, without any text on the pages to diminish their visceral impact.
 

Shorn of their faces and without cases these could be any kind of machine not just a watch.  Perhaps these are parts of some larger mechanism or the controls of some fearful weapon. These images inspire imagination!

Here are some examples:





Keep your sightglass full, your fiebox trimmed and your water iced.
KJ

What is it for again?

Wednesday, July 31, 2013 0 comments

Babbage engines...


Heh!

I love Wondermark

Keep your sightglass full your firebox trimmed and your water iced.
KJ

"Steam Powered USB drive"

Saturday, June 1, 2013 0 comments

Sort of.
This is a noisy, but very cool device for carrying all those pdfs of old books and manuals around.



Keep your sightglass full, your firebox trimmed and your water iced.
KJ

The Babbage Difference Engine

Sunday, September 30, 2012 0 comments

The Computer History Museum has a copy of the Babbage Difference Engine built in London.
The machine does what its designer intended and it does it well.  This is beautiful machine, elegant and complex, it embodies one of my prime Steampunk aesthetics, that the workings of machines are beautiful as well as functional.
Keep your sightglass full, your firebox trimmed and your water iced.
KJ

The Babbage Engine at The Computer History Museum
Charles Babbage (1791-1871), computer pioneer, designed the first automatic computing engines. He invented computers but failed to build them. The first complete Babbage Engine was completed in London in 2002, 153 years after it was designed. Difference Engine No. 2, built faithfully to the original drawings, consists of 8,000 parts, weighs five tons, and measures 11 feet long.
We invite you to learn more about this extraordinary object, its designer Charles Babbage and the team of people who undertook to build it. Discover the wonder of a future already passed. A sight no Victorian ever saw.
An identical Engine completed in March 2008 is on display at the Computer History Museum in Mountain View, California.
Here is the engine in action.



Mechanical Computers in the US Navy

Friday, September 28, 2012 0 comments

Following on from yesterdays video post of Mechanical Principles by Ralph Steiner.
This video has lots of interesting mechanism that could be useful for my Absinthium project.
In this case these mechanisms are used for computation in the fire control systems of US Navy Warships. An interesting solution to the continuous calculations necessary to target a moving ship!
Enjoy
Keep your sightglass full, your firebox trimmed and your water iced.
KJ

Mechanical Computers in the US Navy.
Lots of good information on how calculations are performed with gears and shafts cool



Computer, made of wood!

Monday, September 24, 2012 0 comments


Mechanical laser-cut gear fractal computer


Brent Thome, a computer scientist in San Francisco, is building a mechanical computer out of beautiful, laser-cut gears that will compute and draw fractals. He's documenting as he goes in a fascinating blog, in which he also recounts his adventures with kinetic wooden sculpture.

Brent Thorne's Blog is here:
Fractal Clockwork

Musings on the metaphysical nature of computing.

Theory of Operation
I could tell you that it took years and years of research and development to create a theory of computation that could be implemented in wood, but alias it would be untrue. The idea was formed after only a few reductions and one night when I couldn't get to sleep. You see, computers are much simpler than our teachers might of taught us in school. You don't even need the Boolean logic primitives to create a computer. These so called primitives are merely symbolic.

The most primitive computer is comprised of only two parts and from these two parts we can create all others. Those two parts are memory and a comparator. Some may claim that any practical computer must also have input and output, but that just is memory, or registers, memory again, or an ALU, nope that's a comparator.

We can further delineate memory into two types, read-only and read-write. We need the read-write type of memory to store temporary values for comparison. For example, read-write memory could be a toggle or counter. Read-only memory is convenient for storing tables or a program, however these two examples are symbolic and not necessary for computation. An example of read-only memory is pegs in a disc, where the presents of a peg represents a symbol.

The true heart of a computer is the comparator. A comparator simply compares two values. One of those two values was read from memory previously and the other value is read at the current position in memory.

Now that we have our fundamental blocks we can start creating all the other complications that are common to modern computers. However, I'm out of time now so that will have to wait until later.
--------------------

This will be a fascinating project to follow.

Keep your sightglass full, your firebox trimmed and your water iced.
KJ

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