# Catalogue Entry: NATP00010

## Mr. Isaac Newton's Considerations upon part of a Letter of Monsieur De Bercé

Source: ‘Mr. Isaac Newton's Considerations upon part of a Letter of Monsieur De Bercé … concerning the Cata drioptricalCatadioptrical Telescope, pretended to be improv'd and refined by M. Cassegrain’, Philosophical Transactions of the Royal Society, No. 83 (20 May 1672), pp. 4056-4059.