Monday, November 09, 2020

Epson WF-7840 Scan to Email Settings for Apple

I have posted a document attached here about this.  I hope the Google search can find the information. It might help save a few hours for those trying.  The linked pdf has the same text as below, plus a set of screen shots showing some of the process and the end screen.  Here is the link again.  Except for this issue, I think the printer is really good and the setup was otherwise pretty automatic.  I have tried lots of these A3 printers and this one definitely leads the pack.  The software is very well done.

The issue is making the new Epson printer send the scan directly to email.  The trick with Apple is that you need an "app specific password" which is complicated if you are a novice because you also have to have "two factor authentication" and then use THAT special password for the EPSON login setup screen.  ** As an afterthought, I saw that the instructions from the Apple link I was given from Telstra Platinum Support includes the App Specific Password retrieval in the email RECEIVE instructions so if you don't receive (as in a printer setup) then you have skipped that part and the SMTP send is not set up!  At least that is my excuse, **

So here is some information about all that.  To speed you, here is a setup screen from the printer control panel:


Scan to Email from Epson WF-7840 Printer
(This might take an hour or so!!)

Date: 2020/11/08


First, Install the Printer Completely

Then Get App Specific Password from your iCloud screen.

In Windows 10 I do these steps:

You need to have iCloud for Windows ( )

You need to have TWO FACTOR AUTHENTICATION set up

go to and log in with your password and then with the authentication from your iPhone

Go to Security section and then generate an APP SPECIFIC PASSWORD, give it a name so you know what it is.


Have you Installed the Printer Completely?

Now, find the IP address of your printer ( mine is ).  You can probably get this from printing out the network status on the printer maintenance sheets or on the control panel go to Settings/Network Settings/Network Status/Wired Lan Wifi Status

Now on the PC, log in to the printer and enter a username and password (these are blank initially).  If you change things from the PC, you might be timed out and you need to go back in and enter again. 

NOTE: But you can change these settings on the control panel too:

On the PC now log into the printer control at the IP address ( as I said, mine is  Yours will be different. If you see a security warning don’t worry it is inside your own house.)

Now you should be in the printer administration screens

Go to the Tab “Network” and then on the left side column choose Email Server/Basic

Fill in the details and instead of your usual password, put in the “App Specific Password” which you see on the iCloud Screen.

Go into the printer administration or do this from the Printer Control Panel.

Fill in the screens as shown here:  The information is as follows:


SMTP AUTH / / the app specific password / / / 587 / STARTTLS / Disabled /

Sunday, October 25, 2020

Mars in Opposition Photographed with iPhone XS Max Camera (real or artefact??)

This all started when I noticed Mars was very bright as I viewed it this month with the naked eye looking East from a location 10 km North of Gingin (-31°20'27.60" S 115°54'28.80").  Gingin is 100 km North of Perth Western Australia and it has very clear skies with hardly any light pollution.  I read that Mars was "in opposition" which means that it is in a direct line, on the same side of the sun as the Earth.  In this position it can be about 62 million km from Earth.  I took a photograph using 3.6x and posted it on Twitter.  It seemed pretty impressive with an orange disc visible.  After I posted it on Twitter I looked around and saw quite a few similar iPhone images on the web.  Then, some smart photography people claimed it was artefact and might be "bokeh" which is a kind of software interpretation.  I invited comments.  The authority on all things astrophysical is @thunderf00t and he came out with a quick answer that, through the telescope, "Mars is angularly about the size of a small crater on the moon." (thunderf00t link here)  Dave Jones checked it out and posted a couple more images showing how bad focus affects the digital camera image, increasing it about 5x (eevblog Tweet from Dave Jones).

I made some observations then, and sure enough, my iPhone could not see any small craters on the moon.  I tested the camera using a tape measure and ruler and discovered the resolution, using 3.6x, was 1 mm at 2 m.  This is an angle of about 0.03 degrees.  According to the laws of physics and trigonometry, the angular size of the moon is 0.524 degrees.  The Moon image from my iPhone was about 10 times bigger than the Mars image.  Thus the angular size of the Mars image was 0.0524 degrees.  From trig', allowing for a base of 6.2E10 meters away and a diameter of 6.7E6 meters, the actual angular size of Mars is 0.006.

Conclusion: iPhone has turned the Mars image into a circle 5x times bigger than it really is.  Clearly I need to upgrade my iPhone and purchase a long lens for it.  Thanks to all the experts.  I enjoyed refreshing my trig, and cosmology.  Its nice to know that some things have not changed since I finished high school 52 years ago.


It was difficult to actually find the angular resolution of the iPhone, since most of the hype about "retina" really refers to the screen image rather than the camera.  But Wikipedia has good information.  Here is what I found out (see also my notes below).

The human eye has an angular resolution of 0.6 arcminutes.  There are 60 arcminutes in a degree so this is 1/100 of a degree. (0.01 degrees).

The iPhone has a resolution of the order of 300 pixels per degree (PPD) which is about 0.003 degrees. My measurement might not have been under ideal conditions.  Lighting, exposure, autofocus etc. seems to have worsened the result by a factor of 5-10.  So iPhone should be better than the eye.  It should be able to resolve mars as a single pixel, but not as a circle.

As an afterthought, I noted that the Jupiter image was about 2x the size of my Mars image and about 1/5 the size of the moon image.  Thus Jupiter had an angular size of 0.1 degrees.  According to trig', with the current distance to Jupiter of 782,905,474 km (7.82E11 m) and a diameter of 139,822 km (1.39E8 m), the actual angular size is tan-1((1.39E8)/(7.82E11)) = 0.01 degrees.  So it is (just) resolvable as more than a pixel but is also being magnified as it really is about 50 times smaller than the moon.

Further Information: Calculations and Image Data

Saturday, July 20, 2019

My memory of the first steps on the moon 50 years ago.

On the 50th anniversary of the first step on the moon, I can add my experience that day, which was at 10:30 am Monday 21st of July in Perth (at 9:30 p.m. Houston time,  July 20, 1969). 
I was in first year medicine at the University of Western Australia. I attended math class, but at 10 am was free to watch the moon landing.
I joined a group of about 100 people in the Student Guild common room, and sat on the floor at the front, waiting for the first steps on the moon, watching a black and white 20 inch TV (no colour in those days).  Reception was poor as it had no real antenna, just a wire coat-hanger stuck into the broken antenna connection!  Being a person who likes to fix things, I didn’t want an intermittent antenna connection to fail at the crucial moment.  So I got up and adjusted the coat hanger.  To everyone’s dismay the picture deteriorated even more.  I was heckled and booed.  This got rather tense and I was not sure I could solve the problem.  Time was running out, 10 minutes to go!!  
In fear of being tarred and feathered, I noticed an open window so I climbed out into the garden, then ran about 500 meters across the grass of the Great Court to the Physics/computer science lecture theatre which had six, perfectly adjusted TV’s, on the side walls.  I made it with minutes to spare, in time to see a “perfect” transmission of John Armstrong’s first steps on the moon.  
50 years later, to the people I left in the Guild common room, I say “sorry about all that”.

Monday, July 23, 2018

My Acute Renal Failure Episode

UPDATE 23 July:(recovering)
In a nutshell...
Fell over
Sore knee +++
?Staph cellulitis culture and aspirations negative
Admission to ER obs
24 hrs fluclox IV (renal status not yet checked)
Vomiting started but went home
36 hrs vomiting nil oral dehydrated
Readmit IV rehydration
Uhoh! Creatinine 450!!
Oliguric ATN
Renal U/S normal
eGFR 6! (Was 90 in January)
Creatinine peaks at 750 almost dialysed
Hypertension 190/110
Sinus Bradycardia HR30 monitored in CCU
Improved a bit, but caught severe cold ?flu
Deteriorated clinically can’t eat
Labs improving
Cold settling
22/07 feeling a bit better and eating a little (looking like Thai cave boy after no food for 12 days).
eGFR 15 (20% of normal)
Now: able to do a few emails, walk 100m, reading a book. Updating this blog.


04/08 eGFR up to 35, Urea and Creatinine 2x normal.  Regaining strength.

Monday, February 19, 2018

Gastric Cooling for Bleeding Ulcers (in 1965)

I just uploaded a finished book written by Dr Wylie D. Gibbons, a 90 year old surgeon from Queensland Australia.  The title, as shown in the image below, is "Gastric Hypothermia for Major Haematemesis".
The book can be downloaded freely, even copied, at the clickable Dropbox web location here.
You can also view the several parts of the book by clicking here, which will make it faster to download.
If you cannot access Dropbox (e.g. from China) please use this link to my web server.


In the 1960's bleeding gastric and duodenal ulcers required emergency surgery.  Well, not exactly!  It was known that, in most cases, bleeding stopped before the patient bled to death.  So the strategy was to give "medical treatment" involving fasting, resting, washing out the stomach with a large bore tube, placing various solutions of drugs and antacids in the stomach, and waiting to see what happened.  All the while the patient was given blood transfusions.  After multiple transfusions, often completely replacing the patient's blood volume, surgery might be tried.  By this time the patient might be close to death and the anaesthesia itself could be fatal.

About then, a surgeon called Wangensteen at the University of Minnesota USA, on the basis of some animal experiments, introduced a machine to automatically lavage the stomach with ice water.  This process caught on and seemed to stop the bleeding in many cases.  At least it was better than nothing.

In this era, Wylie D. Gibbons learned the technique, critically evaluated then improved on it, and collected a series of patients in Rockhampton Queensland.  These formed the basis of his first thesis submitted in 1965 to the University of Queensland.  The thesis was rejected.  Read on if you are interested.

My comment on the back cover is as follows:
"In the absence of the true cause of peptic ulcer, patients faced a future of terrible suffering or death and clinicians were desperate to save them. In Rockhampton Queensland, the person who took on this heroic duty was the local surgeon, Dr Wylie Gibbons." 

Links to the Book:

The book is identified by ISBN-13:978-1974454174 and ISBN-10: 1974454177

Wylie D. Gibbons Publishing, 
Villa 240, 
60 Endeavour Boulevard, 
North Lakes, Queensland 4509, 

Hard cover copies are available (printed as required) for USD$100 from the author. 
The book can be downloaded freely, even copied or reproduced, at the clickable Dropbox web location here.
You can also view the several parts of the book by clicking here, which will make it faster to download.
If you cannot access Dropbox (e.g. from China) please use this link to my web server.

Sunday, July 19, 2015

Hand Pain from using the iPhone

For several years I have noticed hand pain when holding the iPhone.  I always just assumed that it was caused by phone radiation heating the hand nerves or inducing a small voltage difference across the crucial membranes therein.  Tonight I performed a quick search on the subject and found a few entries claiming that it was a type of repetitive strain injury (RSI) or carpal tunnel syndrome.  I also saw various comments and replies attributing this phenomenon to "texter's thumb".
Personally I don't believe these.  There is no doubt that phone radiation can heat things, like my thenar muscle.  If I had time I would design a double blind placebo controlled study to test my hypothesis.  I think this would be a good school science project.  There is no evidence base for an opinion either way and if there was evidence (in the secret Apple archives) they would be crazy to release it.  Meantime, I'll keep an eye on this subject - maybe with a Google Alerts search as shown in this link which searches for "hand pain from radiation of iPhone".
Am I concerned? Not a bit.  We know that phones can heat things in their immediate proximity.  If they caused tumours we would have a massive outbreak of brain tumours amongst people like myself who have used a cellphone for 20 years.  It isn't happening.
The lesson from this is that plenty of content on the internet is useless, or just plain wrong.  This might include my comments here!

Thursday, July 09, 2015

Blogging Recommenced after Shenzhen Stock Market Fizzles

I have decided to re-start my blogging and will try to do a post at least each month, as I learn something new which I think might have value.  My thoughts came about when I saw a presentation two weeks ago by Kanghong Pharmaceuticals in Chengdu.  They were just about to list on the Shenzhen stock exchange.  Then they listed and three days later a mini global meltdown and a few trillion Yuan devaluation occurred in China stock prices.  Except for Kanghong!  Yep, they have a real product but their listing story is not what you would expect on Wall St.  However, there is no actual factual news available on the web for the lazy business people news services to re-write and publish.  This means in a vacuum of information, anything is news.  Therefore, from Shenzhen, any information can go viral and result in speculation.  As I see it, by throttling the information, the Chinese government ensures that market volatility prevails!  A brief article about the leader at Kanghong is here: "New Billionaire Clan Defies China's Wealth Plunge."
Chinese links can find more about Kanghong Chengdu Pharmacuetical company by searching on this name: ๆˆ้ƒฝๅบทๅผ˜่ฏไธš้›†ๅ›ข