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Vladimir Zworykin demonstrates electronic television (1929)

Meanwhile, Vladimir Zworykin was also experimenting with the cathode ray tube to create and show images. While working for Westinghouse Electric in 1923, he began to develop an electronic camera tube. But in a 1925 demonstration, the image was dim, had low contrast, and poor definition, and was stationary. [57] Zworykin's imaging tube never got beyond the laboratory stage. But RCA, which acquired the Westinghouse patent, asserted that the patent for Farnsworth's 1927 image dissector was written so broadly that it would exclude any other electronic imaging device. Thus RCA, on the basis of Zworykin's 1923 patent application, filed a patent interference suit against Farnsworth. The U.S. Patent Office examiner disagreed in a 1935 decision, finding priority of invention for Farnsworth against Zworykin. Farnsworth claimed that Zworykin's 1923 system would be unable to produce an electrical image of the type to challenge his patent. Zworykin received a patent in 1928 for a color transmission version of his 1923 patent application; [58] he also divided his original application in 1931. [59] Zworykin was unable or unwilling to introduce evidence of a working model of his tube that was based on his 1923 patent application. In September 1939, after losing an appeal in the courts, and determined to go forward with the commercial manufacturing of television equipment, RCA agreed to pay Farnsworth US$1million over a ten-year period, in addition to license payments, to use his patents. [60] [61]

In 1933, RCA introduced an improved camera tube that relied on Tihanyi's charge storage principle. [62] Dubbed the "Iconoscope" by Zworykin, the new tube had a light sensitivity of about 75,000 , and thus was claimed to be much more sensitive than Farnsworth's image dissector. [ citation needed ] However, Farnsworth had overcome his power problems with his Image Dissector through the invention of a completely unique "multipactor" device that he began work on in 1930, and demonstrated in 1931. Womens Pureboost X Tr 30 Fitness Shoes Black adidas 51JtalrYzL
[64] This small tube could amplify a signal reportedly to the 60th power or better [65] and showed great promise in all fields of electronics. Unfortunately, a problem with the multipactor was that it wore out at an unsatisfactory rate. Mens Shadow Trainers Black Brütting wgY5O2a

Not really. Icon fonts have a few nasty problems that icon font makers rarely make you aware of. Here’s a few of these problems:

If you serve icons from a service, that services might randomly go down. I’ve seen this over and over again with big and small websites.

You can’t easily edit icons, and it’s hard to see what’s been updated in source code control. Webfont files are for the most part binary and changing one icon normally means the whole resulting font file is different.

There’s blurry rendering on certain browsers. Some CSS properties have to be abused (like -webkit-font-smoothing: antialiased; ) to make the icons look good. This doesn’t work in some browsers and in some browser versions.

Most importantly, when icons are in the same CSS block, or when centered in an odd-width container, you get off by half-a-pixel blurryness , which can’t be corrected. This happens on all browsers, even on the latest and greatest Firefox, Chrome and Safari (even though Safari is doing better than IE, Firefox and Chrome, I’ve seen it happen on Safari as well).

Here’s some screenshots from GitHub on IE 10, showing this issue (it also happens with other browsers, like Chrome):

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we had a clever setup with SVG source files (on a precise 16×16 grid) and using fontcustom to compile fonts and doing some post-processing of the generated CSS with sed (most to remove unwanted font variants, as you only need woff in recent-ish browsers).

We also required to add some special headers when serving these font files so that our CDN (Amazon CloudFront) would correctly serve them.

All of this worked, but… blurryness alarm!

Even-width container:

Odd-width container:

Let’s take a step back and ask—what do you need from an icon? Why do icon fonts appear to be a good solution? And how can the problems be fixed?

Inline SVG to the rescue…

Here’s our current workflow:

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view source print ?

Calling on icon_xxxx generates inline SVG as shown below:

Boom—problem solved. This works great on all browsers, and you don’t get any of the rendering issues that you have with icon fonts.

Actually there’s several unexpected advantages:

The only downside is perhaps that your HTML will be slightly larger than it would be with an icon font, which might result in slighter longer loading and rendering times. This is offset by not having to load an icon font in the first place, however, and in my tests has not been a problem at all. A possible way to reduce the HTML size is to set data-icon attributes on elements and have JavaScript insert the inline SVG (I’d say you’re probably better off with directly rendering tho, as running JavaScript isn’t “free” either).

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Thomas Luke Jarocki, managing director of consulting and training for Emergence One International, is an internationally recognized expert, author, and thought-leader when it comes to integrating project management expertise with organizational change management proficiency. A frequent and popular presenter with PMI audiences worldwide, Thomas has logged nearly 25,000 hours working with various project teams across the United States, Latin America, Europe, and the Middle East. His influential…

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