Elizabethan navigator John Davis, author of The Seaman's Secrets and inventor of the Backstaff.
https://thonyc.wordpress.com/2023/06/01/the-seamans-secrets/
#HistoryOfNavigation #ScientificInstruments

Elizabethan navigator John Davis, author of The Seaman's Secrets and inventor of the Backstaff.
https://thonyc.wordpress.com/2023/06/01/the-seamans-secrets/
#HistoryOfNavigation #ScientificInstruments

On Friday, May 26, a group of students from our course "Experimental history of science" will replicate / reconstruct / rework the Foucault pendulum experiment in the hall of the MED building @epfl_en. Drop by if you're around! #histsci #scientificinstruments

https://t.co/imaVb7pwrX

The tools we use are one of my favorite things about making #QMagnetics #benchtopNMR spectrometers. Yesterday we received new Borite lathe tools with TT-321 carbide inserts. The inserts are supposed to have a 1/64” tip radius. That’s important, so we checked them on an optical comparator. #NMR #scientificInstruments #chemistry #machinist

The tools we use are one of my favorite things about making #QMagnetics #benchtopNMR spectrometers. Yesterday we received new Borite lathe tools with TT-321 carbide inserts. The inserts are supposed to have a 1/64” tip radius. That’s important, so we checked them on an optical comparator. #NMR #scientificInstruments #chemistry #machinist

Running late this week but it's finally here: A new blog post – The Renaissance rise in scientific instrument making #scientificinstruments #Renaissancescience
https://thonyc.wordpress.com/2023/01/1

Running late this week but it's finally here: A new blog post – The Renaissance rise in scientific instrument making #scientificinstruments #Renaissancescience
https://thonyc.wordpress.com/2023/01/13/renaissance-science-xlviii/

Through Ages, Cultures, Concepts: Instruments in Collections, Books, Archives.

Call for Papers, Posters and Sessions.

42nd Scientific Instrument Symposium 18 - 22 September 2023 | Palermo, Italy

https://docs.google.com/document/d/1i2DHstPauY-KOYqEM1_bJQ3lWhFED8mO/edit?usp=share_link&ouid=100568599966818651343&rtpof=true&sd=true

#scientificInstruments #conference #museums

Precision Pretzels?

Can Johannes Hevelius's famous sextant work ...
as a pretzel? #pretzant #scientificinstruments

This Anubis gas balance, by the American Recording Chart Co., was used to measure the density of gas mixtures. In the chamber there is a beam balance with a glass bulb on one end. The buoyancy force on the bulb depends on the density of the gas filling the chamber, and the balance is calibrated so it directly reads density relative to air over the range 0.5 to 1.5. On the name plate, the Egyptian deity Anubis balances a feather against a human heart. #chemistry #physics #scientificInstruments

This Anubis gas balance, by the American Recording Chart Co., was used to measure the density of gas mixtures. In the chamber there is a beam balance with a glass bulb on one end. The buoyancy force on the bulb depends on the density of the gas filling the chamber, and the balance is calibrated so it directly reads density relative to air over the range 0.5 to 1.5. On the name plate, the Egyptian deity Anubis balances a feather against a human heart. #chemistry #physics #scientificInstruments

This is a Cahn model 21 electrobalance, with last digit of 0.1 μg on the most sensitive scale. I don't have the pans for it, but here it is weighing a bit of stainless wire that reads 94.4 mg on another balance, so it seems to be working. Have you ever used one of these? What did you use it for? This one is for magnetic susceptiblity measurements. #chemistry #NMR #NMRchat #scientificinstruments #physics

This is a Cahn model 21 electrobalance, with last digit of 0.1 μg on the most sensitive scale. I don't have the pans for it, but here it is weighing a bit of stainless wire that reads 94.4 mg on another balance, so it seems to be working. Have you ever used one of these? What did you use it for? This one is for magnetic susceptiblity measurements. #chemistry #NMR #NMRchat #scientificinstruments #physics

I’m the kind of #physics person who likes to build #ScientificInstruments, lately #benchtopNMR #spectrometers for #chemistry. I need lots of #tools to do my thing. This is my #Hardinge HLV-H #lathe, just after I finished a renovation in 2017. It was made in 1968 in Elmira, New York. In that era in the US, there were two competing high-precision “tool room” lathes, this one and the Monarch 10EE.

I’m the kind of #physics person who likes to make #scientificinstruments, recently #benchtopNMR spectrometers. I need a lot of tools for what I do, some electronic, some chemical, and some mechanical. Here’s my Starrett bench micrometer. Look closely and you can see it’s giving the right answer for a 40 mm gauge block. #chemistry #NMR

I’m the kind of #physics person who likes to make #scientificinstruments, recently #benchtopNMR spectrometers. I need a lot of tools for what I do, some electronic, some chemical, and some mechanical. Here’s my Starrett bench micrometer. Look closely and you can see it’s giving the right answer for a 40 mm gauge block. #chemistry #NMR