Unpublished manuscript, 'Plan de nouveau régulateur de compensation propre à remédier à la dilatation et contraction des métaux; pour les pendules d'observation physique et astronomique' ['Plan for a new compensation regulator to fix the dilation and contraction of metals; for clocks for astronomical and physical observations'] by H [Hubert] Sarton Paper by Sarton regarding his design for a new regulator for use in astronomical clocks that would mitigate the effect of temperature and air on the clock's function. On final page verso is an upside-down graphite inscription reading '[John] Ellicot pendulum 35 years ago'. A manuscript note in ink pasted to this page reads 'See a paper of Ellicot in Phil Trans on pendulums...' and below 'Abstract of my answer: All is known to our workmen and much already published by Mr Ellicot. The R S do not give an opinion [...?] give back your paper'. Subject: Scientific Instruments / Engineering [1788]