11[May 1756] (Adams Papers)
...and greater Plenty of Grain. He can form a Communication between remotest Regions, for the benefit of Trade and Commerce, over the yielding and fluctuating Element of water. The Telescope has settled the Regions of Heaven, and the Microscope has brought up to View innumerable millions of Animals that Escape the observation of our naked sight.
1216 [i.e. 17] Monday. (Adams Papers)
...and greater Plenty of Grain. He can form a Communication between remotest Regions, for the benefit of Trade and Commerce, over the yielding and fluctuating Element of water. The Telescope has settled the Regions of Heaven, and the Microscope has brought up to View innumerable millions of Animals that Escape the observation of our naked sight.
13To Benjamin Franklin from William Shipley, 1 September 1756 (Franklin Papers)
for his work on electricity and microscopes; above,
14From Benjamin Franklin to Deborah Franklin, 19 February 1758 (Franklin Papers)
A Mahogany and a little Shagrin Box with Microscopes and other Optical Instruments loose, are for Mr. Allison if he likes them; if not, put them in my Room ’till I return. I send the Invoice of them, and wrote to him formerly the Reason...
15To Benjamin Franklin from Ezra Stiles, 30 March 1758 (Franklin Papers)
(Frankfurt, 1742), which told of a microscope that made a variety of minute particles visible to the eye. John Campbell translated it into English in 1743, with the subtitle “The Sage’s Triumph over Old Age and the Grave.” In a Dublin edition of... 1760, the microscope is described on pp. 55–7.
16From Benjamin Franklin to John Kirke, 3 June 1758 (Franklin Papers)
Order: I never ask’d Mr. Titley for the Money for the Microscopes and other Optical Glasses, because I was not sure they would be acceptable; but I sent them per Budden, and hope they got safe to Hand. In answer to this Letter, remark G. Keith has not writ any Letter, to the Directors. That our Estimate was chiefly taken from the Monthly Review. That we have rece’d the Microscope &c.
17[Summer 1759.] (Adams Papers)
There is a linear, a superficial and a solid Amplification. Thus if a Globe of one Inch in Diameter, appears thro a Microscope, 10 Inches in Diameter, This Microscope magnifies lineally 10 times, superficially 100 times and in solidity 1000 times, because the solidity is amplified in a cubical and the superficies in a quadratical Proportion to the Amplification of the Diameter. So that a Glass...
18To Benjamin Franklin from François Willem de Monchy, 9 January 1767 (Franklin Papers)
When I was last in London I bought two microscopes for a Friend, of Mr. Benj. MartinBenjamin Martin (1704–1782) was an instrument maker, one of whose most successful devices was a pocket microscope; and a writer on scientific subjects, whose
19To Benjamin Franklin from I. M. Luther, 16 March 1767 (Franklin Papers)
La Complaisance que vous avez euë à me procurer une aussi jolie Perspective me fait prendre la Liberté à vous prier derechef de m’envoyer le plutôt possible encore un pareil, de même qu’un microscope simple avec des changements usités, de cuivre jeaune dans un Etuïe. Si ce microscope peut-être arrangé de façon à en
20To Benjamin Franklin from François Willem de Monchy, 15 May 1767 (Franklin Papers)
My Father joins me in compliments and thanks for the trouble you have had in procuring such accurate information concerning the Fire Engine, and also for inquiring about the microscopes which at length I have recieved.