Computer Controlled Variable Aperture Soap Film Iris – First Bubbles!

I’m fascinated with ephemeral phenomena,  and the most recent manifestation of this has led me to invent some elaborate technical apparatus to make photographs of huge bubbles doing interesting things.  Here are two videos of it working for the first time- the first with a series of close-up views of different components, the second as a wide-view of the whole system in operation.

Giant bubbles are uniquely able to engage and delight people of all types.   Who can resist feeling wonder and awe at giant, floating, opalescent, undulating transparent orbs and the salience they give to normally invisible 3-dimensional flows?  After my first experience blowing bubbles from a moving bicycle (the wind past the bicycle removes any requirement to blow or move the wand, you just adjust your speed to get the right wind),   I was hooked.

I’ve organized a number of bubble blowing events,  especially the “Bubbles on Bikes Jamboree Ride” for Bike Pittsburgh’s Bikefest and the first ever “Giant Bubbles Flash Mob”.   For the latter, I manufactured 45 giant bubble wands,  and about 25 gallons of giant bubble juice,   and coordinated a synchronized release of ridiculously many   insanely huge giant bubbles.    Beyond the pre-arranged 45 bubble blowers,  we had the fully invested attention and participation of somewhere between 300 and 500 people for several solid hours.  All for about two days prep and maybe $200 in materials (including the pizza for the wand-making party).    See the nicely polished video made by Ben Saks of Float Pictures here,  or the great single-take cellphone video clip from Jason Kirin here.


For some things I’d like to do, I required a highly repeatable way of producing bubbles,  and controlling aspects like timing and size and speed and direction.  I also love a good engineering challenge,  and so I invented a cable iris aperture mechanism and set out to use it to make a uniquely flexible and useful bubble machine.  A CNC bubble machine.

There’s a few very sophisticated things I’d like to do with this which I’ll write about later, but for the first project I’m looking forward to making playful occupational portraits of some friends, mentors, and elders I feel lucky to know and learn from.  I’m fortunate to have a few such in my life,  in their sixties, seventies and eighties,  and who in addition to great technical accomplishments, embody wonderful spirits of playfulness and creativity in their golden years that it’d be my pleasure to honor and record with such portraits.

Computer Controlled Giant Bubble Blower Progress Update 11/14/04

Today I got the cables laced with a new, more robust-seeming cable than the cotton yarn I’d been using.   I also plumbed up  the fluid delivery needle valve and solenoid,  so it’s ready to go.

I let the system cycle open and closed a few thousand times while I worked,  once every second or two.

A hiccup occurred when the stepper motor was accidentally overdriven due to a mis-setting of the “run current” on the Vexta stepper driver.  This overheated the motor and caused a motor fault,  most likely a shorted coil.  Thankfully I’ve got a bin of stepper motors from various past projects and all that’s required to fix it is to 3D print a new adapter cog,  which links the new motors 0.233″ diameter shaft,  to the existing bicycle sprocket gear.  The old adapter was a 0.25″ diameter shaft.  Thankfully, modifying the CAD file, exporting a new STL model,  and 3-D printing a new pulley adapter requires only about 15 minutes of my time (with the print then occurring in the background for maybe 30 minutes).    Wiring in the new motor (identifying the color code of the stepper’s wires and soldering it to the cable connector) will take perhaps 45 minutes.

“The Human Scale” to show at 3RFF, Panel Discussion to Follow with Notables of City Bike-Ped Initiatives

The Human Scale is a gorgeous film about the ways in which the organization of our infrastructure shapes our lives.  Much of the last 50 years has seen cities organized around cars, with tragic consequences for common spaces and face-to-face human interaction.    The human scale documents some of the best efforts at bringing cities back to life as places for human, not automotive, interaction.

I am honored to get to introduce the film and, following the showing,  moderate a panel discussion with notable figures from the mayor’s office of community development,  the mayor’s office Bicycle/Pedestrian Coordinator,  and Bike Pittsburgh.

The Human Scale shows at the Harris Theater downtown,  809 Liberty Avenue,  on Thursday November 13th at 7:00 pm.  Panel Discussion to follow.   Tickets are $9, and can be bought online or in person.

Where will you say you were when, at 10:40 EST, humanity first landed a probe gently onto the surface of a comet in deep space?

Can you fathom what it must feel like to be one of the astronomers who, 45 years ago, discovered a comet, and is here today watching as we as a species are rendezvousing with that comet, gently landing a 200 pound Philae probe onto the surface, while we watch from the orbiting Rosetta spacecraft 19 miles above?

This is so humbling and inspiring to witness. Congratulations to everyone involved, especially the engineers which, by the various slingshot maneuvers, accelerated this spacecraft so deep into space on such a perfectly accurate trajectory to hit a bullseye hundreds of millions of miles away!!

Watch this amazing animation of the incredible 12 year long, half-a-billion-mile, bullseye we will see stick it’s landing here in less than one hour!!

May your life be as smooth as Silicon-Bronze TIG brazing.

small heptagon with square tubing at 45 degrees from flat, after welding and wire brushing.
An experiment in jig construction, TIG-brazing, and symmetry. This took about an hour from conception to completion, much of which was locating the V-blocks for clamping the tubing at 45 degrees during cutting.
Small heptagon with square tubing at 45 degrees from flat, as tacked together, showing fit-up.
Tacked at ID and OD. The fit of the bevel cuts is sublime! not a sheet of paper could be inserted at ID or OD of any joint. Spot on 64.3 degree (=90-(180/7)) bevel!

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Next step:  make four of these with the tubing’s face to table’s face angles sampling intervals of 0, 22.5, 45, and 67.5 degrees (or generally, angle increments of ([0:(n-1)]/n) * (360/(number_of_tubing_facets_equals_4_if_square_tubing)) degrees rotation from flat.   Make a jig to photograph them at consistent position,  then make looping stop motion animation of toroidal ring rotating around it’s minor axis…

Then,  perhaps, I will also incrementally crush each ring as I’ve done to destructively test prior similar experiments,  and register each frame,  so the animation might suggest continuation of the rotation throughout the increasing deformation.

Animated Retroreflective Safety Signage

I’ve been playing with a new process in which I remove the silvering of mirrors in detailed patterns,  leaving optically clear glass.

A zone plate made of mirror and optically clear glass zones will focus images in both reflectance and transmission.  The focal length of this plate, at visible wavelengths, is too long to be practical though.  I'm experimenting with shorter focal length, finer ring spacing, zone plates.
A zone plate made of mirror and optically clear glass zones will focus images in both reflectance and transmission. The focal length of this plate, at visible wavelengths, is too long to be practical though. I’m experimenting with shorter focal length, finer ring spacing, zone plates.

My first experiment was to make a Zone Plate,  but my current process didn’t have enough resolution to make fine enough lines for a zone plate of short focal length at normal visible wavelengths around 600nm:

However, the process is fantastic for barrier grid a.k.a. moiré a.k.a. ‘strip’ animations,  and for an afternoon project this has borne incredible fruit:  only about a dozen promising directions to go from here!  I decided to focus first on making an animated cautionary text and moving image safety sign for vehicles, especially bicycles,  especially helpful for night-time visibility.

 

Holy Moly, my friend and mentor was just awarded the Nation’s Highest Honor for Technology and Innovation!

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Mary Shaw is presented with the National Medal of Technology and Innovation by President Barack Obama at the White House.
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Photo courtesy of Mary Shaw

The National Medal of Technology and Innovation (NMTI) is the nation’s highest honor for technological achievement, bestowed by the president of the United States on America’s leading innovators. The recipients for this year were announced by President Obama on friday, and my most esteemed friend and mentor Mary Shaw is one of them!

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Mary Shaw is a gem.  She is a fantastically interesting, diversely competent, engaging, and modest person who I befriended and formed an immense respect for while completely ignorant  of her great eminence as Carnegie Mellon University’s Alan J Perlis University Professor of Computer Science (where she has taught since six years before I was born).  As we met she was to me simply an engaging, creative, person who’d engage in conversations over a workbench,  ‘soldering iron in hand’,  on subjects spanning LED lighting,  investment casting of custom metal drawer-pulls,  glider piloting,  glider construction, hot air balloon piloting,  critical path analysis, vortex rings, bicycling, bicycle touring, bubble blowing mechanisms,  bubble blowing while bicycle riding,  tensegrity sculpture design, math, physics, engineering, relationships, photography… everything.

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Mary introduces my puppy, Watz, to riding a bicycle.

When I proposed organizing a group bicycle ride for Bike-Fest here in Pittsburgh, for which riders would be equipped with bubble blowing equipment to produce large numbers of bubbles in the air we moved through, she and her husband Roy enthusiastically participated on a tandem.   They made the cover of the local paper,  riding that tandem and blowing bubbles, during the Pedal Pittsburgh Ride.

Mary and her husband Roy,  who I will occasionally assist as part of his Hot Air Balloon chase-van and recovery team (Mary is a pilot too,  of rigid winged gliders), are a marvelous couple.  They give a great model of what I imagine a happy seventh decade might best look like. They are frequently seen about Pittsburgh riding their tandem bicycle,  or working together at Techshop.  They ride the 330 mile Great Allegheny Passage bike path 330 miles between Pittsburgh and Washington DC every year,  revising their trail guide and publishing trip reports which have proven very helpful to other riders.  Their guide book is available for minimal cost, and their earlier trip reports can be found online.

Copyright Gordon Kirkwood 2014
Sometimes I organize giant bubble blowing flash mobs. It should not be surprising that immensely creative, intelligent, and eminent folks like Mary Shaw and Roy Weil, or Lowry Burgess, embrace these sorts of whimsy. This one was attended by about 400 people. An excellent video was produced by Ben Saks at http://vimeo.com/68497111

I found out about this award today after just talking with her Monday – she did me the huge honor of recommending me to the Autodesk Pier 9 Artist Residency,  which l have applied for –  and didn’t even bring it up.  Not that I’m one she’d brag to, but I think it’s representative of a quality I admire very much,  of understated but immense competence.

 

Mary Shaw,  Gordon Kirkwood, and Pittsburgh's new mayor Bill Peduto outside of Whimsy Engineering's office at Techshop Pittsburgh,  after President Obama's address there on the subject of innovation and entrepreneurship in America.
Mary Shaw, Gordon Kirkwood, and Pittsburgh’s new mayor Bill Peduto outside of Whimsy Engineering’s office at Techshop Pittsburgh, after President Obama’s address there on the subject of innovation and entrepreneurship in America.

 

Links:

http://www.whitehouse.gov/the-press-office/2014/10/03/president-obama-honors-nation-s-top-scientists-and-innovators

CMU’s Shaw honored with National Medal of Technology and Innovation

Carnegie Mellon’s Mary Shaw Will Receive National Medal of Technology and Innovation

Obama taps computer pioneer Mary Shaw for National Medal of Technology and Innovation

http://en.wikipedia.org/wiki/Mary_Shaw_(computer_scientist)

 

 

 

US Patent #8154279 Issued To Gordon Kirkwood &co. for Non-Destructive Magnetic Sensor of Graphitization Corrosion

Grey Iron and Ductile Iron Pipe are the dominant conveyances of water and sewage in American infrastructure.    These types of iron have carbon and iron constituents whose relative distribution and crystal sizes determine their mechanical properties.    Over time,  this material are susceptible to ‘graphitization corrosion’ in which either graphite particles migrate and aggregate (typically at temperatures above 800F)  or in which local electrochemical corrosion at room temperature results in preferential loss of the iron / ferrite constituent of the matrix. When this happens, the pipe becomes brittle, and mechanical insults like vibration  or thermal stresses can exceed the flexibility of this now brittle material,  leading to brittle failure and cracks. However, this corrosion can be invisible,  because the remainder graphite particles are cohesive and the pipe appears physically unchanged.

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Illustration from the patent, indicating changing composition of portions of a grey iron pipe wall, in cross section.

During road work, construction, and maintenance operations, these pipes are visually inspected,  but because pipes experiencing graphitization corrosion often look physically unchanged – the graphite material remains in the same contour as the original material,  a method of detecting the change in properties of the pipe was needed which did not depend on visual changes, or subjective “bang on it with a hammer” subjective methodology,  as was the state of the art previously.  We needed a non-destructive method of detecting the changing properties of the pipe.

The insight of this patent is that the changing microstructure of the graphitized material has reduced magnetic properties due to the loss of iron.   This could be sensed by measuring the magnetic permeability of the pipe,  or it’s consequential magnetic measurements like inductance or the force developed within a fixed magnetic field.   At the urging of my mentor Dr. Mehrooz Zamanzadeh,  President and Principal Scientist of Matco Services,  and with my assistant Sam,  I developed a prototype sensor and confirmed that magnetic flux concentration,  magnetic force, and inductance measurements are all viable methods of non-destructive detection of changed microstructure and ferrite loss in grey iron and ductile iron pipe.     US Patent 8154279 was issued on April 10th 2012 for “Non-destructive testing apparatus for the detection of graphitization of iron”
US08154279-20120410-D00004 US08154279-20120410-D00005

Moth Mainstage sells out Byham Theater, Gordon Kirkwood Soloist on Cello

Copyright Gordon Kirkwood 2014
Sold out Byham Theater! capacity 1,300

I was honored to be invited to perform as the soloist and featured performer for the Moth Mainstage event at the Byham theater in Downtown Pittsburgh.

from the Pittsburgh Arts and Lectures writeup:

“The acclaimed storytelling group, The Moth, based in New York City, will return to Pittsburgh on Wednesday, August 27, 2014, for a sixth annual appearance presented by Pittsburgh Arts & Lectures.  Consistently a sell-out event, The Moth Mainstage is a two-act show featuring five true stories, told live and without notes. A mix of celebrated raconteurs and storytelling novices from Pittsburgh and beyond, this year’s lineup will explore the theme “Don’t Look Back” in wildly divergent ways.”

—–

The Byham theater has 1300 seats,  and it was sold out.   As lights dimmed at the beginning,  then after the intermission, I walked on stage and played my own compositions on unaccompanied Cello. I then sat on stage through the whole event,  in the best seat of the house,  eight feet from each performer.

The theme was “Not Looking Back”.

  • Kate Tellers told a warm story about  her 85 year old mother’s last hours,  with family and friends gathering around, sharing cheeses and familial warmth,  paying their respects as the old lady felt her death approaching and called a loving family near.
  • Vanessa German told a wrenching story of the most positive perspective shift,  on the occasion of the recent death of her abusive schitzophrenic mother, and the moments and words surrounding her death,  and the perspective she found to forgive her mother instead of resent her,  and give her in dying the sort of comfort and tenderness that she and her 5 siblings so long sought themselves.
  • Richard Price told a fascinating story of his 15 year old great grandfather, born in 1900, as a short 110 pound napoleon-complex russian jew in the bronx with not much sense, taking on a gang of killers and thugs, the fein gang,  in their lair to secure their release of a girl to her mother.  And of how that gang got back at him by praising his courage,  welcoming him, then initiating him by sending him to beat up a girl in a picket line who turned out to be his cousin,  who he begged to play along,  but would not.  The gang saw he betrayed the intent of his initiation (he did not cripple his cousin) and he fled to the docks to save his life,  got hired by a merchant ship (despite the sailor’s tale that a jew on a boat is bad luck),  and then having further problems of similar origin when he confronted (on the third day of the journey) one of the rude sailors who demanded coffee from him, by dumping the pot of coffee on his head.  His grandfather was then KEELHAULED,  and survived.  When they got to Algiers,  his grandfather was again duped by the villains, and the sailors made peace with him and offered to take him out for a night on the town,  visiting a brothel,  and eventually slipping him a mickey finn,  knockout drops, and tattooing this jewish boy from the bronx with a large christian cross on his arm, before abandoning him in port of Algiers.   He was told that tattooing over a  fresh tattoo would kill him (infection?), but replied to the tattooist he’d rather return to his mother dead, than for her to see a christian cross on his arm-he wanted the tattoo transformed to an anchor.  He was rendered quite sick, but had the second tattoo, and then as a penniless teenage boy, made his way back from Algiers to New York over 6 months in or about 1916.
  • Horace Sanders told a story about his divorce and reconciliation with the mother of his third through eighth children.
  • Cole Kazdin told a story about how she broke up with her boyfriend of several years,  amiably, then was rendered amnesic in a stunt she was roped into as a TV actress (being thrown in the air in a cheerleader outfit amongst people who were supposed to catch her, but didn’t).  She forgot the breakup, and doctors asked her boyfriend to play along for the first few days.  The details of how she would make post-it notes to collect details of her life, foreign to her, were fascinating.

 

copyright Gordon Kirkwood 2014
Sold out crowd of 1300 holds their cell phones up to show themselves, upon the host’s request, after intermission. He pulled out an iPhone and I realized I had my Nikon and wide angle lens just offstage, and so I present to you here my 2.5 second exposure, handheld, on stage before 1300 people holding up cellphones. (C) Gordon Kirkwood 2014.
The view from my seat
The view from my seat

A great pleasure of the evening,  in addition to talking to fascinating people all night, was getting to play solo cello for a half hour in the empty Byham before doors opened.  It is a surprisingly live space,  and there was no problem filling it with unamplified cello.   Perhaps the highest point personally came shortly after I’d played at the beginning of the event, as the host chose to take the first two minutes of the event to tell 1300 people about how impressed he was with the other stuff I do.

Backstage just before going on,  I got to talk to a stranger who turned out to be the executive director of the Pittsburgh Arts and Lectures Series,  Stephanie Flom, who was to follow me onstage to introduce the event.    She and her husband Peter,  I learned later,  met at Pitt,  from which they graduated the year before I was born,  in an experimental degree program in  social activism.  Her career has spanned arts management,  social activism,  her own artistic career,  environmental education, and library and theater establishment. It also turns out we used to be neighbors.  #talktostrangers.