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From: Jan Panteltje <alien@comet.invalid>
Newsgroups: sci.electronics.design
Subject: Re: OT: central limit theorem
Date: Sat, 27 Apr 2024 05:36:19 GMT
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On a sunny day (Fri, 26 Apr 2024 14:46:52 -0400) it happened bitrex
<user@example.net> wrote in <662bf69c$0$8484$882e4bbb@reader.netnews.com>:

>I have one of these inexpensive Ikea bookshelves for storing some of my
>electronics books:
>
><https://www.ikea.com/us/en/p/laiva-bookcase-black-brown-40178591/>
>
>I noticed the center shelf was starting to sag a few degrees. :( The 
>assembly manual specifies a weight limit of 33 lbs evenly distributed 
>which seemed like an oddly specific number. So I weighed the books on 
>the shelves, which aren't particularly well organized other than to 
>fully fill the available space widthwise on each shelf.
>
>A random assortment of hardbacks and paperbacks, some are tall and 
>skinny, some are short and fat. And each shelf was clocking in at 33 lbs 
>+/- 2 lbs.
>
>So I guess a heuristic for filling these shelves is just fill 'em up 
>then remove the heaviest book, and de-rate the center shelf by maybe 5- 
>10 lbs because it's unsupported by a backing.

Digitise as many books as you can, some books are already available for free as pdf on the internet.
That thing looks feeble.. buy a real bookshelf
All that said, the Ikea table I am working on now is from around 1986?
 https://panteltje.nl/pub/table_IMG_6589.JPG

I use this Ikea chair for some electronics work and when playing the keyboard :-)
 https://www.ikea.com/nl/nl/p/kullaberg-bureaustoel-grenen-zwart-10320341/
They do make nice stuff.

Have not many books left, but more than a thousand discs like CDs, DVDs, blurays.., lots of data on those.
 https://panteltje.nl/pub/CD_box_binnenkant_IXIMG_0549.JPG

Some 4 TB harddisks, 'locate' in Linux will find anything in seconds, weight a few grams...
locate -i book | grep -i pdf
.....
/mnt/sda2/pantel/root/download/html/gps_ca_generation_code_program_and_more_booktext05.pdf
/mnt/sda2/pantel/root/download/html/imbookfinalall.pdf
/mnt/sda2/pantel/root/download/html/mit_heat_transfer_textbook_ahttv131.pdf
/mnt/sda2/pantel/root/download/html/national_temp_sensor_handbook.pdf
/mnt/sda2/pantel/root/download/html/on_semi_pfc_handbook_HBD853-D.PDF
/mnt/sda2/pantel/root/download/html/pin_diode_handbook.pdf
/mnt/sda2/pantel/root/download/html/pin_diode_handbook.pdf.1
/mnt/sda2/pantel/root/download/html/pin_diode_handbook.pdf.2
/mnt/sda2/pantel/root/download/html/power_factor_correction_handbook_PFC_HBD853-D.PDF
/mnt/sda2/pantel/root/download/html/radiation/photo_detectors/PMTs/PMT_handbook_v3aE.pdf... 181 entries
.....
Not everything is marked as 'book', but subject you will find !

Soon everything encoded in DNA, just injected... ?