Diagram, micrometer and stand by [Robert Hooke?] Figure of micrometer on the second page. Labelled figure 5, represents a stand holding an instrument which can be tightened with clamps. Subject: Astronomy Published in Philosophical Transactions as 'A description of an instrument for dividing a foot into many thousand parts, and thereby measuring the diameters of planets to great exactness, &c. as it was promised, Numb. 25.' [1667]