A Few Calculators : Notes from the Oesper Collections, No. 43, March/April 2017

“Comptometer” hand-cranked mechanical calculator.

A circa 1930 American-made “Comptometer”
hand-cranked mechanical calculator.

Issue 43 gives a brief overview of some of the desktop and hand-held calculators used by chemists over the years and currently on display in the hallway outside of the Oesper Collections in Rieveschl Hall.

Click here for all other issues of Notes from the Oesper Collections and to explore the Jensen-Thomas Apparatus Collection.

 

 

 

 

A Zeiss Butter Refractometer : Notes from the Oesper Collections, No. 42, January/February 2017

The circa 1920 Zeiss butter refractometer recently acquired by the Oesper Collections.

The circa 1920 Zeiss butter refractometer recently acquired by the Oesper Collections.

Issue 42 describes a new addition to the museum’s refractometer collection – a circa 1920 Zeiss butter refractometer – and its historical importance as a means for rapidly differentiating between pure butter and margarine.

Click here for all other issues of Notes from the Oesper Collections and to explore the Jensen-Thomas Apparatus Collection.

 

 

 

 

A Varian E-4 EPR Spectrometer : Notes from the Oesper Collections, No. 41, November/December 2016

The Varian E-4 EPR instrument as it appeared while still in use in Dr. Bobst’s laboratory.

The Varian E-4 EPR instrument as it appeared while still in use in Dr. Bobst’s laboratory.

Issue 41 describes a new addition to the instrument collection on the mezzanine of the chemistry-biology library. Dating from the early 1970s, this desktop Varian E-4 Electron Paramagnetic Resonance (EPR) Spectrometer was donated by Dr. Albert Bobst of the UC Chemistry Department.

Click here for all other issues of Notes from The Oesper Collections and to explore the Jensen-Thomas Apparatus Collection.

Liebig and Combustion Analysis : Notes from the Oesper Collections, No. 40, September/October 2016

Justus von Liebig (1803-1873) posing with his apparatus for combustion analysis.

Justus von Liebig (1803-1873) posing with his apparatus for combustion analysis.

Issue 40 outlines the history and importance of the chemical technique known as combustion analysis and highlights a reproduction of Liebig’s famous 1831 instrument for this purpose made by the late Dr. Melvyn Usselman of the University of Western Ontario and donated to our museum collections in 2005.

Click here for all other issues of Notes from the Oesper Collections and to explore the Jensen-Thomas Apparatus Collection.

 

 

 

 

The Steelyard Balance : Notes from the Oesper Collections, No. 39, July/August 2016

A recently acquired 19th-century Chinese steelyard or so-called “opium balance” with an 11” ivory beam and accompanying “teardrop” storage case

A recently acquired 19th-century Chinese steelyard or so-called “opium balance” with an 11” ivory beam and accompanying “teardrop” storage case

Issue 39 briefly outlines the history and principles underlying traditional single pan or “steelyard” balances and illustrates their evolution using examples from our museum collections.

Click here for all other issues of Notes from The Oesper Collections and to explore the Jensen-Thomas Apparatus Collection.

 

 

 

 

 

 

The Case of the Wandering Model : Notes from the Oesper Collections, No. 35, November/December 2015

Hans Jaffé (1919-1989)

Hans Jaffé (1919-1989)

Issue 35 recounts the recent discovery of a plaster model of the electron density of naphthalene discovered in the bottom drawer of one of the filing cabinets belonging to the late Hans Jaffé, who served as the UC chemistry department’s specialist in quantum mechanics from 1954-1989.

Click here for all other issues of Notes from the Oesper Collections and to explore the Jensen-Thomas Apparatus Collection.

 

Oesper News: 3 New Museum Booklets are Now Available

Dr. William B. Jensen has added three new Museum Booklets to the series on the history of chemical apparatus.   These new titles are:

  • Classic Voltaic Cells
  • Electrolysis Cells
  • Classical Molecular Weight Determinations

Each booklet contains several photos and illustrations of the chemical instruments and people involved in these aspects of chemistry history. You can access all the booklets by clicking here.

 

Bad Behavior has blocked 724 access attempts in the last 7 days.