What are test-tube stoppers made of?

Stiff rubber types of test-tube stoppers (of high chemical resistance) are made of M35 Green Neoprene1 and are known by the trade name “Plasticoid” The “hollow”, translucent, pliable, thin plastic type of test-tube stoppers are made of Polyethylene2 or Low-Density Polyethylene3, the latter being known by the trade name “Dynalon” The “vent”/”cap”, clear, hard, brittle,…

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OSX FTDI/USB Serial adapter only creates new /dev/cu.* for each USB port/reboot

Dsplay Kexts kextstat | grep -v apple # all non-apple kexts kextstat | grep FTDI Result: 171 0 0xffffff7f83efe000 0x8000 0x8000 com.FTDI.driver.FTDIUSBSerialDriver (2.2.18) 638ECCC3-375D-CD1A-C2EC-0DC14740FC9C <137 52 5 4 3 1> https://superuser.com/questions/1135730/how-to-release-reset-serial-port-ftdi-devices-mac-osx#comment1649421_1136084 Un/Reload FTDI Kext sudo kextunload -b com.FTDI.driver.FTDIUSBSerialDriver sudo kextload -b com.FTDI.driver.FTDIUSBSerialDriver Result from kextunload: kernel) Can’t unload kext com.FTDI.driver.FTDIUSBSerialDriver; classes have instances: (kernel) Kext…

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I-V Curve Characteristics of Semiconductors on the cheap (Mostly…) *WIP*

The need for this testing setup arose while I was playing with making semiconductors from scratch. Specifically simple diodes from complete scratch. One being Cuprous Oxide, with interest in Aluminum Oxide as well. While poking around with a graphite lead on the Copper Oxide layer, it quickly dawned on me that there was no really…

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Thomson (Mirror) Galvanometer – *WIP*

This research is in the document and information gathering stage The patent we are looking at: (English/UK) Patent Number 329, 1858 February 20th “Thomson’s Improvements in Testing and Working Electric Telegraphs” Physical copy: http://special.lib.gla.ac.uk/manuscripts/search/detail_c.cfm?ID=94776 Best online source so far: “English Patents of Inventions, Specifications, 1858, 317 – 399” Page 62 (in the PDF) https://books.google.ca/books?id=uOJg2EbSJ5EC&lpg=RA38-PA1&ots=Btc_iV27DI&dq=English%20Patents%20of%20Inventions%2C%20Specifications%2C%201858%2C%20317%20-%20399&pg=RA5-PA1#v=onepage&q&f=false Mention…

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Core Rope Memory

After friends became excited about the existence of Core Rope Memory as proposed by NASA for the Apollo Guidance Computer, I decided to build a proof of concept. The concept in this case was building the memory as a literal, flexible rope. The actual implementations were normally made into a rigid assembly with the cores…

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