Baruch SpinozaWikipedia

Spinoza earned a modest living from lens-grinding and instrument making, yet he was involved in important optical investigations of the day while living in

Spinoza's Lathe

Jul 09, 2008· I have never seen a lens grinding lathe, but I have noted that the word lathe is used for very different machines by people in different branches of mechanical work. I have seen a modern machine for grinding the concave side of eyeglass lenses, but I don't recall what it was called. It probably was a way of mechanizing the motions of the people

Baruch Spinoza, Rationalist Philosopher

6. Three Lens-Grinders: Spinoza, Leeuwenhoek, and Huygens. Spinoza opted to become a lens-grinder, a vocation which has received differing assessments, some rather abbreviated. A well known work on Spinoza makes a very fleeting reference to this activity, comprising only four words, "grinding and polishing lenses" (Hampshire 1988:170).

Baruch Spinoza: Heretic, Lens GrinderCataract and Other

Oct 01, 2000· On July 27, 1656, the following text was read in Hebrew in front of the ark of the Portuguese-Jewish synagogue on the Houtgracht in the Vlooienburg quarter of Amsterdam where the Sephardic Jews (as well as their poorer Ashkenazic neighbors) tended to reside:

Baruch (Benedict) Spinoza > By Individual Philosopher

Baruch Spinoza (AKA Benedict Spinoza) (16321677) was a Dutch philosopher of Portuguese Jewish origin who lived and worked during the Age of Reason.. Along with René Descartes and Gottfried Leibniz, he is considered one of the great Rationalists of the 17th Century, although the breadth and importance of his work was not fully realized until years after his death.


To begin grinding operations a small pan partly filled with #220 or #240 carborundum or Aloxite mixed with water is placed nearby with a one inch paint brush in it to apply the mixture to the surfaces. Apply some to the lens and the grinding tool (the latter being the glass tool or the concave of the flint element).

Spinoza, Baruch: Spinoza's LifeInfoplease

He died of tuberculosis, apparently aggravated by his inhaling glass dust from lens grinding. Through Gotthold Lessing, Johann Gottfried von Herder, and Johann Wolfgang von Goethe, Spinoza influenced German idealism. During his lifetime and for a period afterward, however, his pantheism was regarded as blasphemous, which is one reason why most

Polishing & Grinding ServicesUnited Lens

Polishing & Grinding Services . United Lens Company employs the latest technology and techniques from high speed double side polishing, single side precision polishing, cylindrical and spherical polishing for all of your custom substrates. ULC grinds, polishes, and finishes optics with consistent and unsurpassed accuracy.

Spinoza's LathePage 2

Oct 07, 2008· Just like the grinding machine, the polishing pad rotates, while the lens is gently moved side to side. Grinding lenses happens at a speed of 1 to 2 revs per second. A few months ago a team from Green Umbrella came to Middelburg to film

Spinoza, Benedict DeInternet Encyclopedia of Philosophy