Hans Landolt and the Conservation of Mass : Notes from the Oesper Collections, No. 55, March/April 2019

A highly stippled photo of Landolt’s balance with two of his counterpoised reaction tubes (7) – the one on the left before reaction and the one on the right after reaction.
A highly stippled photo of Landolt’s balance with two of his counterpoised reaction tubes (7) – the one on the left before reaction and the one on the right after reaction.

Issue 55 summarizes, using the resources of the Oesper Collections, the work of the Swiss-German physical chemist, Hans Landolt, on the experimental verification of the law of conservation of mass in chemical reactions. 

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A Complete Qual Lab : Notes from the Oesper Collections, No. 54, January/February 2019

The extraordinary
lab bench, chemicals
and equipment for
performing qualitative
chemical analysis offered for sale in the 1902
catalog of the Viennese
laboratory supply house of Lenoir and Forster.

Issue 54 reviews the various chests of reagents and apparatus sold over the last 250 years to private chemists and students wishing to perform qualitative chemical analysis and as highlighted in our collections of apparatus catalogs and monographs.

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

Some Blowpipe Equipment : Notes from the Oesper Collections, No. 52, September/October 2018

A portable Berzelius oil lamp for blowpipe analysis. The additional ring and alcohol lamp could be used to evaporate mineral water samples for analysis.
A portable Berzelius oil lamp for blowpipe analysis. The additional ring and alcohol lamp could be used to evaporate mineral water samples for analysis.

Issue 52 highlights items in the Oesper Collections related to the practice and teaching of blowpipe analysis.

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Named Glassware, Notes from the Oesper Collections, No. 46, September/October 2017

Assorted 19th-century round-bottom wine flasks from the Oesper Collections
Assorted 19th-century round-bottom wine flasks
from the Oesper Collections

Issue 46 explains that common laboratory glassware is often named after famous chemists of the past, though the exact reason for these name choices is not always obvious.

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A Few Alembics : Notes from the Oesper Collections, No. 45, July/August 2017

A reproduction of a circa 17th-century alembic with an “ostrich”-necked cucubert, clay luting, various receiving flasks, charcoal furnace, bellows, tongs, and poker
A reproduction of a circa 17th-century alembic
with an “ostrich”-necked cucubert, clay luting, various
receiving flasks, charcoal furnace, bellows, tongs, and poker

The 45th issue of Museum Notes gives a brief history of the oldest known distillation apparatus as illustrated by various reproductions found in the Oesper Collections.

 

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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.