Brian,
You don't fall within either 4,5 or 6 sigma. You are a special person with a
most unusual background. In comparison, my early days, and even as an adult,
is rather mediocre. Not that I'm unhappy, but retrospectively seen, I would
liked little more sensations and thrill. The years I've known you, I see a
guy who seeks challenges, bold, curious, ambiguous, restless, positive and
constantly working with new ideas. Kind of mini-Leonardo. I agree with Bev,
you should write a biography. I will be the first to buy!
Thanks for all good things from you and may you prosper many years still.
Inge
-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Brian Ellis
Skickat: den 1 september 2007 09:31
Till: [log in to unmask]
Ämne: [TN] OT: reminiscences
When I was a student, in 1948, I took a summer job with a company making
aircraft gyroscopic gunsights. My work involved:
1. mixing potassium bichromate with fish glue
2. applying a coat of this mix to a very thin blackened steel sheet
3. after drying, exposing same to UV light through glass photographic
plates with registration pins, turning over and doing the same on
t'other side (different plate)
4. developing the image with hot water
5. etching the sheet in nitric acid
6. rinsing in clean water
7. stripping the resist in boiling strong sodium hydroxide solution
The result was about twenty graticules with two curved, very fine,
slots. If two were placed back-to-back, depending on their respective
positions, two dots of light shone through. These were projected on a
half-silvered mirror and the gunner would turn a knob to align the two
dots of light with the wingtips of the enemy aircraft, to get the range.
This was a very hazardous job but it was my first (but not last!)
experience of using a photoresist for etching a metal. Can anyone beat
this kind of work, going back 59 years? :-)
Brian
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
