Chatty 5.0~beta is out!
https://source.puri.sm/Librem5/chatty/-/tags/v0.5.0_beta
This is the first Chatty released with integrated MMS support!
"Farmers have already told us that they’re buying older tractors to avoid the software repair restrictions that manufacturers like Deere put in place." https://www.vice.com/en_us/article/wxd8wy/the-used-tractor-market-is-far-wilder-than-the-used-car-market
After doing more research it turns out this razor was known as the King Oscillator and is one of the few safety razors out there that require proprietary blades! No wonder you don't see many of these around anymore...
Dragging the chain and hearing the gears click into place is very satisfying--nice tactile feedback. However, carrying a one across the whole register takes some force. It looks nice and is OK as a small desktop calculator, but subtracting w/ it makes me prefer the Addometer.
Multiplication is repeated addition, shifting left for each digit in the multiplier. Here is 12 x 12. Because of the extended complements for subtraction method, division is possible but not ideal.
To clear the register, you turn the knob on the bottom right side anti-clockwise until all the digits say 0.
The chain only moves in one direction, so to subtract you have to use the complements method. To subtract 42 from 31342, I add 9999958.
These are portable, but are bigger and heavier than other pocket calculators of the time and primarily sat in or on a desk using the kickstand, and were used for quick arithmetic. To add a number, insert a stylus at the corresponding digit and drag down to the bottom.
These are known as chain adders. By inserting a stylus and dragging the chain down, you increment the register. You can see the carry mechanism in this video, which uses a spring-loaded tooth that rides along the outside of the gear and engages with the next gear only after 9.
"If it's free, you are the product" stopped being true once the rest of the companies saw how much money there was in selling customer data. Now you are the product regardless of whether you pay.
It's so profitable to sell customer data that Vizio now makes 2x as much from that than selling TVs. Until the govt outlaws this data collection, your only recourse to protect your #privacy is to buy things from the few companies left that respect it. https://gizmodo.com/welp-vizio-now-makes-twice-as-much-from-advertising-as-1848034943
Division aside though, this is my favorite lever style adding machine in my collection to use, due to the subtraction key and overall key placement that enables one-handed operation. I could actually see myself using this to balance a checkbook if I still did that sort of thing.
Technical author, FOSS advocate, public speaker, Linux security & infrastructure geek, author of The Best of Hack and /: Linux Admin Crash Course, Linux Hardening in Hostile Networks and many other books, ex-Linux Journal columnist.