Obsolete units of measurement | Units of electrical resistance
The Siemens mercury unit is an obsolete unit of electrical resistance. It was defined by Werner von Siemens in 1860 as the resistance of a mercury column with a length of one metre and uniform cross-section of 1 mm2 held at a temperature of zero degrees Celsius. It is equivalent to approximately 0.953 ohm. Glass tube cross sections are typically irregularly conical rather than perfect cylinders, which presented a problem in constructing precise measuring devices. One could make many tubes and test them for conical regularity, discarding the least regular ones; their regularity can be measured by inserting a small drop of mercury into one end of the tube, then measuring its length while sucking it along. The cross-sectional area at each end can then be measured by filling the tube with pure mercury at a fixed temperature, weighing it, and comparing that weight to the relative lengths of the mercury drop at each end. The tube can then be used for measurement by applying a formula obtained from these measurements that corrects for its conical shape. The Siemens mercury unit was superseded in 1881 by the ohm; the name "siemens" was later reused for a unit of electric conductance. (Wikipedia).
Mercury Arc Rectifier - Siemens
Glowing arc rectifier in a glass enclosure. The arc rectifier was replaced by the diode in the early part of the 20th century. The mercury arc rectifier as large and fragile and therefore was not practical over time as a power converter. It converted AC power to DC power using current thro
From playlist Early AC Power History
Mercury - Periodic Table of Videos
The liquid metal Mercury is element number 80. More links in description below ↓↓↓ Support Periodic Videos on Patreon: https://www.patreon.com/periodicvideos A video on every element: http://bit.ly/118elements More at http://www.periodicvideos.com/ Follow us on Facebook at http://www.f
From playlist With Portuguese subtitles (Português) - Periodic Videos
All about Mercury, the Liquid Metal | Element Series
In this video, I'll be talking about the very interesting element Mercury. I try to cover as much as I can, including its properties, its history and interesting reactions. Let me know what other element you would like to see. Keep in mind that this takes a lot of work though, and that no
From playlist Mercury
Astronomy - Ch. 10: Mercury (17 of 42) How much Solar Radiation does Mercury receive?
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain how much of the Sun's heat (solar radiation) is received by Mercury compare to Earth. Next video in this series can be seen at: https://youtu.be/l4gAcx5LD8s
From playlist ASTRONOMY 10 MERCURY
Solar power monitoring and logging solution - Part 1
I put together a "cheap" solution to monitor and log power from my test solar system.
From playlist Electronic Measurement Equipment
Identify the spectral lines of Mercury light by a coarse diffraction grating
Enjoy! Music: https://www.bensound.com/royalty-free-music
From playlist Optics
Wheatstone Bridge: A (Not So) Honorable History
Charles Wheatstone introduced "his" bridge in 1843 but it was first invented in 1833 by Samuel Christie. This is the story of *why* these men invented this device and the convoluted tale of how it got its name. Links: My mailing list: https://kathylovesphysics.ck.page/welcome My Patreo
From playlist "The Lightning Tamers": A History of Electricity
Solar Powered Alarm Clock - Part 2
This is the wrap up of the Solar Powered Alarm Clock. I also introduce some new projects I will be working on.
From playlist Solar Powered Projects
Lec 10 | MIT 16.885J Aircraft Systems Engineering, Fall 2005
The DoD and the Space Shuttle View the complete course: http://ocw.mit.edu/16-885F05 License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
From playlist MIT 16.885J Aircraft Systems Engineering, Fall 2005
In this video, I will be extracting and refining mercury metal from mercury sulfide (cinnabar). This is a chemical method, which is safer than the typical heated one. It is a follow-up to this video: https://youtu.be/S4T57SFntIs This process was developed by Plante1999 from the Sciencem
From playlist Mercury
Solar Powered Alarm Clock - Part 1
In this (perhaps non practical) project I convert a 120 volt mains alarm clock to solar power.
From playlist Solar Powered Projects
Lec 25 | MIT 3.091 Introduction to Solid State Chemistry
Solutions: Solute, Solvent, Solution, Solubility Rules, Solubility Product View the complete course at: http://ocw.mit.edu/3-091F04 License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
From playlist MIT 3.091 Introduction to Solid State Chemistry, Fall 2004
Electrical Engineering: Basic Laws (15 of 31) Conductance in a Parallel Circuit
Visit http://ilectureonline.com for more math and science lectures! In this video I will find the total resistance, currents in each branch, and conductance in a parallel circuit. Next video in this series can be seen at: https://youtu.be/57oOzagzyAY
From playlist ELECTRICAL ENGINEERING 2 BASIC LAWS
Source Boston 2010: ZigBee Hacking and the Kinetic World 2/6
Clip 2/6 Speaker: Josh Wright. InGuardians, Inc. ZigBee has been established as a low-power wireless protocol, boasting features that make it attractive for smart grid technology. Combined with the Smart Energy Profile, ZigBee is quickly becoming a staple technology in the home area netwo
From playlist SOURCE Boston 2010
EEVblog 1465 - Your Multimeter Can Measure Inductors
Handy tip on how you can use your multimeters capacitance range to measure inductors, using the reciprocal method. Forum: https://www.eevblog.com/forum/blog/eevblog-1465-measure-inductors-using-a-multimeter/ Support the EEVblog on: Locals: https://locals.com/member/EEVblog Patreon: http:
From playlist Electronics Tips & Advice
DDPS | Machine Learning and Physics-based Simulations – Yin and Yang of Industrial Digit
Description: Combining the digital and the real world will be key to address the mega-challenges ahead of our society. Sufficiently accurate and fast digital models of assets, products, systems, and infrastructures are required to do so. This will only be achieved in the remaining time fra
From playlist Data-driven Physical Simulations (DDPS) Seminar Series
19. Using pints for units in python
It's critical to keep track of units in scientific computing. Fortunately, python has a few options for tracking and converting units. Here we show you a unit conversion library and the power pint library. We also introduce scipy constants and the molmass library to calculate elemental mol
From playlist Intro to Python Programming for Materials Engineers
The Mercury Thermometer: Where did it come from? | Stuff of Genius
Daniel Fahrenheit built several types of thermometers, but his Stuff of Genius wasn't restricted to a few temperature measuring devices. Tune in and learn how Daniel Fahrenheit invented the system that bears his name today. Learn the stories of unsung inventor heroes and their trials, tri
From playlist Stuff About Technology
OWASP AppSec EU 2013: The SPaCIoS Tool: property-driven and vulnerability-driven security testing
For more information and to download the video visit: http://bit.ly/appseceu13 Playlist OWASP AppSec EU 2013: http://bit.ly/plappseceu13 Speakers: Luca Compagna | Luca Viganò In this talk, we present how the SPaCIoS Tool supports security analysts and developers in the security assessmen
From playlist OWASP AppSec EU 2013