Author: Dave Farquhar

f strings in Python

Dave Farquhar Software
f strings in Python

When you first encounter f strings in Python, they can seem like a dark art. And you can use them without understanding them. I’ve used f strings to get myself out of a bind, based on a code snippet I found on Stack Overflow or some other discussion board, with a comment saying not to ask me why it works. But here’s what they do and how they can help your code.

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In memoriam: Angel, 2005-2022, best dog ever

Dave Farquhar Personal
In memoriam: Angel, 2005-2022, best dog ever

It was the summer of 2006. We had been married a little over a year, and we decided together it was time to get a dog. We started looking, and buying the stuff we needed. Then one fateful Saturday, we took a trip to the Humane Society on Macklind Avenue.

We had a good idea what we were looking for. We had no idea we were going to find all that and more.

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No Ox ID for model railroading

Dave Farquhar model railroading
No Ox ID for model railroading

In 1965, Linn Westcott, the longtime editor of Model Railroader magazine, wrote an article about how he never cleaned the track on his layout. His secret was a product called No Ox ID A Special. Let’s talk about No Ox ID for model railroading.

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What flux is made of

Dave Farquhar DIY
What flux is made of

Flux is a chemical compound that makes soldering much easier. Flux serves two purposes, cleaning oxides and other impurities from metal surfaces and helping the solder to flow. What flux is made of varies depending on the purpose.

Frequently you can tell what flux is made of from the color. If it’s white, it’s probably acidic and meant for plumbing, and if it’s a weird shade of amber, it’s made of rosin and suitable for electronics.

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What is a DOS game?

Dave Farquhar DOS, Retro Computing
What is a DOS game?

It seemed like an innocent enough question to me. Two game developers were talking, one older than the other, and the older said something about developing a DOS game, and then the younger asked, what’s a DOS game?

A DOS game is a game that runs on PC hardware but under MS-DOS or PC DOS rather than Microsoft Windows.

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Why circuit boards are green

Dave Farquhar Hardware

Why are circuit boards green? It’s a matter of practicality. While circuit boards aren’t always green, green provides technical advantages. So that makes green the most common color for printed circuit boards, or PCBs.

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Unique Art Manufacturing Co of New Jersey

Dave Farquhar Toy trains
Unique Art Manufacturing Co of New Jersey

Unique Art Manufacturing Co of New Jersey was a manufacturer of tin lithographed toys, based in New York City and Newark, New Jersey. It was founded in 1914 and faded away between 1951 and 1955. Its president, Samuel Berger (not Bergman), was an inventor with at least four patents to his name, and his company was one of the few U.S. makers of tin lithographed toys in the postwar era.

There is a great deal of incorrect information floating around about the little known company, including the name of its president and founder.

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Tandy 1000 vs PCjr

Dave Farquhar Retro Computing
Tandy 1000 vs PCjr

The Tandy 1000 vs PCjr is a natural comparison. The Tandy 1000 is exactly the computer the IBM PCjr should have been. That means there are similarities, but it also means significant differences. So here’s what they were. It goes a long way toward explaining why one was a notorious flop and the other was a raging success.

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Where is Route 66 in St. Louis?

Dave Farquhar St. Louis
Where is Route 66 in St. Louis?

Where is Route 66 in St. Louis? Two Missouri highways, 366 and 100, claim to be the old Route 66. Why? Because it changed over the years. Both have legitimate claims to Route 66 heritage, so let’s talk about the history, how far apart the roads are, and what makes both of them interesting.

There were at multiple alignments of Route 66 through St. Louis from 1926 to 1975, so no wonder it’s complicated. The two major ones are the 1926-32 version, along the modern MO-100, and the post-1932 version, which is approximately MO-366. There was also a bypass route, which served approximately the same function as the modern I-270/I-255 outerbelt today, but it was closer to the city, and all on the Missouri side.

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Cast iron vs ductile iron vs steel

Dave Farquhar DIY
Cast iron vs ductile iron vs steel

I heard a discussion at a hardware store about the types of metal that tools are made of, and the impact it has on cost and on flexibility. I thought it was worthwhile to share and elaborate on some of what I heard. What’s the difference between cast iron vs ductile iron vs steel? Generally, it’s strength, hardness, and flexibility. And those factors generally come down to the carbon mixture.

Ductile iron is a form of cast iron, but it has carbon mixed into the alloy to make it more flexible, less brittle, and give it a higher strength overall. Steel is also a mixture of carbon and iron, but it has less carbon than ductile iron, the precise mix depends on the properties you want. Read more