📣📪 🚚 Adafruit will not be shipping USPS orders Monday January 20, 2020 🗓. Expedited USPS orders placed after 11am ET 🕚 Friday January 17 will go out Tuesday January 21 📣📪🚚
0

Look at This Incredible Eye Test Chart Circa 1907 by George Mayerle

I love that this chart – made by a German-born optometrist – contains multiple alphabet and logogram styles. This allowed patients of various language capabilities indicative of the inhabitants of late 19th c./early 20th c. San Francisco in which the doctor worked to get a proper eye exam – while also allowing anyone who didn’t speak (or read!) one of the common languages shown to use the iconographic column in the middle for their exam . Spotted over at the Public Domain Review, they also quote the National Library of Medicine’s Stephen P. Rice:

Running through the middle of the chart, the seven vertical panels test for acuity of vision with characters in the Roman alphabet (for English, German, and other European readers) and also in Japanese, Chinese, Russian, and Hebrew. A panel in the center replaces the alphabetic characters with symbols for children and adults who were illiterate or who could not read any of the other writing systems offered. Directly above the center panel is a version of the radiant dial that tests for astigmatism. On either side of that are lines that test the muscular strength of the eyes. Finally, across the bottom, boxes test for color vision, a feature intended especially (according to one advertisement) for those working on railroads and steamboats.

Brilliant! I wish I could find out more about the railroad and steamboats color indicators!

Read more.


Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Join 15,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

What do you want from CircuitPython in 2020?

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7:30pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/


Maker Business — Apple’s Mac Pro doesn’t fall far from the tree

Wearables — How to twist light

Electronics — Linear Love

Biohacking — Vitamin-C + Gelatin for Accelerated Recovery

Python for Microcontrollers — CircuitPython snakes its way to Teensy 4.0, i.MX Feathers take flight and more! #Python #Adafruit #CircuitPython @circuitpython @micropython @ThePSF @Adafruit

Adafruit IoT Monthly — Learning from IoT Projects, Adafruit Joins the LoRa Alliance, Ring Ransoms, and more!

Microsoft MakeCode — MakeCode: Opening a World of Possibilities

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.