HARRISONS 'H4' HOLOGRAMS: Stopping Time
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| Part Number | 10 | |
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| License | CC Attribution 3.0 Unported: You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor. | |
| Identifiers | 10.5446/20942 (DOI) | |
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1
4
00:00
Event horizonBlock (periodic table)Personal digital assistantSlide ruleNetwork topologyBitXML
01:07
Plotter
01:22
Lattice (order)Frame problemGraph (mathematics)Latent heatLine (geometry)Uniqueness quantificationGroup actionDigital photographyBit
03:15
HypothesisDigital photographyEstimatorGreen's functionFrame problemSoftware testingComputer animation
04:01
Computer programmingSource codeCASE <Informatik>
04:27
CASE <Informatik>HorizonMultiplication sign
04:40
BitGraph coloringFrame problemPlotter
05:09
Touch typingMoving average
05:29
ResultantMedical imagingBitAreaNatural number
06:00
SurfaceSpacetimeProcess (computing)
06:13
Laser
06:24
ReliefObject (grammar)
06:58
CASE <Informatik>Multiplication signComputer configuration
07:08
Multiplication signProcess (computing)Reflection (mathematics)Medical imagingPoint (geometry)Event horizonSlide ruleLinear regression
Transcript: English(auto-generated)
00:01
How do you follow that? And those guys have just achieved everything I've ever wanted to do in holography. Okay, um Welcome everybody To this very special event This is going to be a rather unusual talk
00:25
Because it's not going to be the delivery of the well-written paper that I've executed for this Conference it's going to know be more of the slide show which explores one particular evening
00:42
In March, March the 13th where just lies Mike Madora from colour holographics and myself recorded the Harrison clock at the Royal Observatory in Greenwich with the most incredible Assistance and help
01:02
Of Johnson Betts who's here this this morning. So here's a picture of the Observatory I'm sure many of you know it The place that the Harrison clock is actually displayed
01:20
Today And here is the Harrison clock Well, I suppose the question is what what made the Harrison clock so Unique. Well, it was one of the most accurate timepieces Produced it was a very unique early piece of technology
01:41
which basically said longitude and the beginning of global positioning and GPS as we know it today, so The Harrison clock has a unique significance within history and
02:01
It was decided at a group meeting of the Royal photographic society holography group That it would be a an interesting Item to record as a hologram And I think the original idea that came from Jeff Blythe Is probably responsible for many many good ideas
02:22
I think Jeff's a bit of a genius but This is one of Jeff's better ideas So we start our journey here We we were obviously Restricted By the fact that it would probably prove impossible to take the clock from Greenwich
02:43
So we decided early on it was a good idea to actually record the clock in situ Easier said than done Jeff and I designed This rather unique frame we can see here as being
03:02
What we would refer to as the holographic camera after much experimentation We came up with this design so We then tested the design we decided it wasn't going to be shot using a helium neon red
03:22
Instead we needed something more up-to-date and I managed to loan a high-powered green diode laser from Klashtech who were based in Germany and You know after 25 years working with lasers, which are incredibly long and heavy this matchbox arrived on my desk
03:44
And It worked beautifully. In fact, it was so strong We had to be you know, very careful where we were looking during the explosion so this this is a photograph of the frame and the the laser Running a test in my lab
04:00
We move on to the day So picture of me Jeff in the middle there being philosophical about something And Mike Vadora staring at his shoes because I think Mike was pretty convinced we weren't going to succeed in this quest And on the far right-hand side you can just see
04:24
Jonathan Betts as he takes the Harrison clock from the case And this is the the time gallery In the museum, you can see a portrait on the back wall there of Harrison himself
04:42
We transferred the clock from the gallery into the workshop where many of the Repairs are carried out on the instruments And it's Jeff looking a bit sheepish again there in the corner. You can see Mike Vadora's plates on the
05:01
side here color holographic plates and Jonathan very carefully resting the clock within the frame Finishing touches there and there it is ready to roll we begin our exposures as Jeff and Mike
05:24
making sure that the clock isn't touching the plate because obviously that would create movement and We had to jump a bit there because we were also involved with the the actual first exposures
05:40
We only had about I think it was six shots, you know to get this, right? We were working late into the night early into the morning hours I think it was about two two o'clock in the morning when we got the final results So here's a picture of Mike just you know after processing. We're not we're still not sure if we've got an image
06:00
Mike's examining the surface of the gelatine space or it's not scratched or damaged and Then in the drying process we all crowded around to see the hologram magically appear And there it is and of course in the laser light it really is
06:22
indistinguishable from the real thing a very relieved Michael door so We've recorded for I think four really good pieces that evening two of those pieces are in the collection of the
06:42
Museum we use the other two to make copies Because the idea is you know, if you've got a unique object then We should produce some copies and at the end of this talk. We're going to present Jonathan and the museum with those copies And there's Jonathan opening the glass case again
07:02
Replacing the watch or Timepiece not watch and a detail there of Harrison holding the the timepiece and the final shot of the Observatory
07:20
So all in all, you know, it's a historical event. It was one which Which shouldn't have happened really because there were so many things going wrong and then on, you know, the last time everything came together and We've got some amazing images. So at this point Graham, would you like to introduce everybody?
07:42
Yes
08:09
Gentlemen, but could we come over this side, please? So these are the two reflection copies that
08:29
He's going to present Jonathan that's the new horologist and the maritime museum
09:18
You