Over 1,000 messages of support for Plan 28

After yesterday's blog post on the state of Plan 28 I've received over 1,000 emails and messages of support for the project. Thank you so much!

I can't possibly reply to everyone personally, but thank you! It means a great deal.

Here are a sample of the heartwarming messages:

I'm in for the long haul!

Get the charity set up ASAP; I want to throw money 
at this project.

Babbage had the patience and perseverance... so do 
we. Just keep going! The pledge holds!

Building one of these things isn't like slapping a 
few parts together. We knew it would be a long 
process. We're here for the long haul.

I'll happily increase my donation in the hope you 
can still reach the original goal.

Many people say "Why?" I say "Why not?" Go for it!

Still very supportive.  Send details of where to 
deposit pledge at any time.

I'm still in for $100. I'd love to see this done 
and one day come to see it in person!

This is a great project and I'll be supporting 
you all the way. 

I REALLY really appreciate the work, and will 
promote it.

I'm still in. Too cool of a project to give up 
on. Let me know what I can do and keep up the 
good work.

Put me down for a £50 pledge.  Good luck, I hope 
(and am sure) you can pull it off.

I sure want to see that machine :D, so keep on! 

I'll never give up on this project.

If you sent me a personal message with a question I will try to answer in the next week.

Comments

Your last name contains invalid characters

My last name is "Graham-Cumming". But here's a typical form response when I enter it:

Does the web site have any idea how rude it is to claim that my last name contains invalid characters? Clearly not. What they actually meant is: our web site will not accept that hyphen in your last name. But do they say that? No, of course not. They decide to shove in my face the claim that there's something wrong with my name.

There's nothing wrong with my name, just as there's nothing wrong with someone whose first name is Jean-Marie, or someone whose last name is O'Reilly.

What is wrong is that way this is being handled. If the system can't cope with non-letters and spaces it needs to say that. How about the following error message:

Our system is unable to process last names that contain non-letters, please replace them with spaces.

Don't blame me for having a last name that your system doesn't like, whose fault is that? Saying "Your last name …

All the symmetrical watch faces (and code to generate them)

If you ever look at pictures of clocks and watches in advertising they are set to roughly 10:10 which is meant to be the most attractive (smiling!) position for the hands. They are actually set to 10:09.14 if the hands are truly symmetrical. CC BY 2.0 image by Shinji
I wanted to know what all the possible symmetrical watch faces are and so I wrote some code using Processing. Here's the output (there's one watch face missing, 00:00 or 12:00, because it's very boring):

The key to writing this is to figure out the relationship between the hour and minute hands when the watch face is symmetrical. In an hour the minute hand moves through 360° and the hour hand moves through 30° (12 hours are shown on the watch face and 360/12 = 30).
The core loop inside the program is this: for (int h = 0; h <= 12; h++) {
float m = (360-30*float(h))*2/13;
int s = round(60*(m-floor(m)));
int col = h%6;
int row = floor(h/6);
draw_clock((r+f)*(2*col+1), (r+f)*(row*2+1), r, h, floor(m…

Importing an existing SSL key/certificate pair into a Java keystore

I'm writing this blog post in case anyone else has to Google that. In Java 6 keytool has been improved so that it now becomes possible to import an existing key and certificate (say one you generated outside of the Java world) into a keystore.

You need: Java 6 and openssl.

1. Suppose you have a certificate and key in PEM format. The key is named host.key and the certificate host.crt.

2. The first step is to convert them into a single PKCS12 file using the command: openssl pkcs12 -export -in host.crt -inkey host.key > host.p12. You will be asked for various passwords (the password to access the key (if set) and then the password for the PKCS12 file being created).

3. Then import the PKCS12 file into a keystore using the command: keytool -importkeystore -srckeystore host.p12 -destkeystore host.jks -srcstoretype pkcs12. You now have a keystore named host.jks containing the certificate/key you need.

For the sake of completeness here's the output of a full session I performe…

John Graham-Cumming

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