Two Chemical Slide Rules : Notes from the Oesper Collections, No. 44, May/June 2017

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Closeup of part of the Ch scale for the circa 1960 Hemmi 257 chemical slide rule.

Closeup of part of the Ch scale for the circa 1960 Hemmi 257 chemical slide rule.

Issue 44 gives a glimpse of two classic chemical slide rules found in the Oesper Collections, one dating from 1814 and the other from 1960.

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

 

 

 

 

 

 

Related posts:

  1. The Dichromate Cell : Notes from the Oesper Collections, No. 25, March/April 2014
  2. The Siemens Elmiskop 1A Electron Microscope : Notes from the Oesper Collections, No. 30, January/February 2015
  3. The Case of the Wandering Model : Notes from the Oesper Collections, No. 35, November/December 2015
  4. A Few Alembics : Notes from the Oesper Collections, No. 45, July/August 2017