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.

 

The Youden pH Meter : Notes from the Oesper Collections, No. 33, July/August 2015

Our recently acquired Youden null-point pH meter. The Moir electrode system, minus one of the salt bridges, is to the left and a circa 1940 bottle of quinhydrone is displayed between it and the meter.
Our recently acquired Youden null-point pH meter. The Moir electrode system, minus one of the salt bridges, is to the left and a circa 1940 bottle of quinhydrone is displayed between it and the meter.

Issue 33 describes a recently acquired compact pH meter from the 1940s that uses a quinhydrone electrode, rather than either a hydrogen electrode or a standard glass electrode.

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

Countercurrent Distribution Once Again : Notes from the Oesper Collections, No. 32, May/June 2015

The circa 1949 Craig cylindrical countercurrent distribution apparatus recently donated to the Oesper Collections by Dr. Edward Bennett (Jensen-Thomas Apparatus Collection).
The circa 1949 Craig cylindrical countercurrent
distribution apparatus recently donated to the Oesper Collections by Dr. Edward Bennett (Jensen-Thomas Apparatus Collection).

Issue 32 describes the recent acquisition of an even earlier version of a Craig countercurrent distribution apparatus than the version that was described in issue 3 of 2010.

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

The Siemens Elmiskop 1A Electron Microscope : Notes from the Oesper Collections, No. 30, January/February 2015

Front view of the Siemens IA Elmiskop in its original location at UC Environmental Health and Safety.
Front view of the Siemens IA Elmiskop in its
original location at UC Environmental Health and Safety.

Issue 30 of Museum Notes highlights the recently acquired, circa 1964, Siemens Elmiskop 1A Microscope now on display on the upper mezzanine of the Chemistry-Biology Library in 503 Rieveschl.

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

Who Invented the Fleaker? : Notes from the Oesper Collections, No. 29, November/December 2014

Typical modern-day fleakers with their patented caps.
Typical modern-day fleakers with their patented caps.

The 29th issue of Museum Notes highlights a recent innovation in laboratory glassware known as the “fleaker” and traces its historical antecedents to a late 19th-century innovation known as the “beaker flask.”

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

The Twitchell Hydrometer : Notes from the Oesper Collections, No. 28, September/October 2014

A brass hydrometer jar with handle and thermometer and two metal hydrometers probably designed to monitor the fermentation of beer
A brass hydrometer jar with handle and thermometer and two metal hydrometers probably designed to monitor the fermentation of beer.

The 28th issue of Museum Notes highlights yet another scientific instrument produced by the 19th-century Cincinnati inventor Henry Twitchell (1816-1875).

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

Sidney Rossiter Benedict : Notes from the Oesper Collections, No. 27, July/August 2014

A circa 1928 Bock-Benedict colorimeter
A circa 1928 Bock-Benedict colorimeter

The 27th issue of Museum Notes tells the story of a UC graduate who, inspired by his undergraduate chemistry teacher, went on to become a nationally prominent physiological chemist and a member of the National Academy of Sciences.

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