2nd annotation

Edward Ford. David Rittenhouse Astronomer-Patriot 1732-1796. University of Pennsylvania Press/Philadelphia, 1946
This book tells the multiple things that David Rittenhouse have done. For thirty-five years, he was an obscure countryman in Norriton township, a farmer, maker of clocks and mathematical instruments, and local surveyor. He also build an instrument of the solar system. For the American Philosophical Society,he built and equipped the Norriton observatory. When the observations were reported and the results were calculated, Rittenhouse was an astronomer of international reputation. Friends of Rittenhouse persuaded him to move into Philadelphia. In the metropolis David Rittenhouse became prominent citizen, member of the Philosophical Society, engineer of public works, active Whig, member of the Assembly, trustee of the Loan Office, and treasurer of Pennsylvania during the Revolution. He still was scholar and scientist. Meetings of the Philosophical Society, astronomical and physical problems, clocks and telescopes were the satisfactions of his life. Until this day, Rittenhouse instruments are still used.