71Rodolph Schaer to Thomas Jefferson, 25 March 1819 (Jefferson Papers)
microscopes [index entry] scientific instruments; microscopes [index entry]
72From John Quincy Adams to John Adams, 28 March 1822 (Adams Papers)
of them all—ascertain where and by whom they were made—Examine as far as you may be permitted to the construction of them—Let not the Telescope, the Microscope, the Air–pump, the Electrical Machine, the Sextant, the repeating Circle, the Theodolite, nor any other of the Instruments which you will see used to explain the Lectures and experiments escape your most inquisitive Scrutiny—Study them...
73Thomas Skidmore to Thomas Jefferson, 18 August 1822 (Jefferson Papers)
the microscope with its spherule eye-glass
74From John Adams to Peter Perpignan, 4 March 1823 (Adams Papers)
I have rec’d y’r letter of the 26th of last month—and I thank you for y’r infinitessinal miniature of President Washington—I cannot see it even with the help of a solar microscope & should not be able to distinguish the features or the figure, clearly enough to know; whether it is a fair representation of the hero
75Thomas Jefferson’s Proposed List of Instruments for the classes of Nat. History & Mathematics, ca. 26 Apr. 1824, 26 … (Jefferson Papers)
Microscope, double, very powerful, not fitted as solar.
76Francis W. Gilmer: Lists of Instruments to be Furnished to the University of Virginia by John Tuther and John Cary, ca. … (Jefferson Papers)
Solar microscope for opake & transparent objects
77To Thomas Jefferson from William H. Fitzwhylsonn, 21 March 1825 (Jefferson Papers)
May I take the liberty to say, that I have in any possession, a new and complete Lucernal Microscope for sale? For viewing microscopic objects, either by day or night, it is considered as an instrument of the very first character. Should such an one be wanted for the University I could venture to recommend it strongly...
78Editorial Note: The Northern Journey of Jefferson and Madison (Jefferson Papers)
...from Wadsworth which has not been found but which must have covered one on the subject from William Robinson. In 1786 Robinson had examined the insect in its various stages with “an excellent microscope” and was convinced it had always been present but some unknown natural phenomenon had caused it to multiply and spread, as was “the Case with the canker Worm, and thousands of other...