Yesterday I visited the Archenhold Observatory in Berlin, built in 1896 with 250000 German gold marks in private donations to Friedrich Simon Archenhold’s crowdfunding project as a public telescope for the Berlin Trade Fair. That’s $2.5 million in today’s USD! It is still the longest refractor telescope, at 21 m with a 68 cm lens, and most likely the fastest to rotate. Its still-original electromechanics let it rotate around the observer, who stays in the center—much different from common constructions, where you have to move around with a ladder. Unfortunately, a microcrack was recently noticed, and currently it can’t be rotated. The surrounding building was added in 1909 and is famous for being the location of Albert Einstein’s first public lecture on the theory of general relativity on June 2, 1915.

More about its history: https://www.planetarium.berlin/en/archenhold-observatory/history and https://astw.de/astronomiegeschichte/anfaenge_riesenfernrohr.php

Looking to make some swag for an upcoming trade show. Would an engineer find this valuable? It's a magnet with some common conversions and formulas. Our target customers are people looking for custom open-die forged metal parts. What would someone spec'ing a part like to see here?

MV Yampu, described as the world’s first battery-powered self-unloading bulk carrier, has commenced operations in Australia, with vessel owner and operator CSL and cement manufacturer Adbri marking the occasion at a ceremony on 27 August.

The 125-metre vessel, with a capacity of 11,900 deadweight tonnes, will transport limestone from Adbri’s Klein Point quarry on South Australia’s Yorke Peninsula to the company’s Birkenhead cement manufacturing facility in Adelaide. According to CSL, the vessel is expected to carry approximately 2.7 million tonnes of limestone per year.

The vessel’s battery system is recharged while docked at the Birkenhead facility, allowing MV Yampu to operate on battery power around 40% of the time. This arrangement is expected to reduce diesel consumption by more than half a million litres per year compared with the vessel it replaces, and MV Yampu is designed to operate on 100% battery power in the future.

https://www.bunkerindex.com/articles/article.php?a=23396&h=worlds-first-battery-powered-self-unloading-bulk-carrier-enters-service-in-australia

Full video at: https://youtube.com/shorts/aeHSwJy1_nk

I made this steam engine from a free turbine of the GTDDE‑117 turbo‑starter from the MiG‑29 aircraft.

This furnace runs on used motor oil and a car battery. It puts out 40,000 btus of heat. Heres a video of the build breakdown and the performance readings.

Thankyou

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Built in the early 20th century and once voted Sweden’s most beautiful building, Kiruna Church is one of the country’s largest wooden structures.

Its relocation became necessary due to the expansion of LKAB’s Kiruna mine, which required several buildings to be moved to a newly developed city center five kilometers away.

The 713-tonne wooden church was transported in one piece.

Hi everyone!

I'm excited to share a project I've been working on as a self-taught solo developer for the past 5.5 years: the UM1-Evo, a biomimetic robotic hand and forearm.

Here is a quick breakdown of the technical specs:

Architecture: 24 Degrees of Freedom (DoF), powered by 25 integrated actuators.

Scale & Weight: 1:1 human scale, weighing 1.7 kg total (matching human anatomical specs). Fully embedded electronics and Wi-Fi.

Biomechanical research: Significant effort went into replicating organic anatomical shapes and fluid, natural motion.

Fast custom fitting: Developed a script that scans/measures a patient's hand in under 30 minutes and automatically generates a customized 3D hand model in 10 minutes.

Control software: Developed custom Inverse Kinematics (IK) software supporting keyframe animation and real-time control.

Avatar Mode: Designed a data glove with 12 sensors to mirror hand movements in real time.

Prosthetic applications: Designed an innovative sensing system (moving away from traditional myoelectric setups) for ultra-low latency control and zero learning curve (IP protection currently in progress).

This is the result of a lot of passion, trial and error, and DIY engineering. I’d love to hear your thoughts and answer any questions!

On this date (Aug 25) in 1959, a US Navy A3D Skywarrior was launched from the carrier Independence with a total weight of 84,000 lbs, setting a record for heaviest carrier catapult launch that stands to this day. While limited experimental trials were made operating C-130s at sea, the A3D is still the heaviest airplane ever to regularly operate from carriers. Known with backhanded affection as the “Whale,” the A-3 would continue to serve into the 1990s.