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Border with mathematical instruments more
This chapter head is made of two parts: to the left and top, an L-shaped steel ruler or square, perhaps, with a weight hanging by a string (a pumb-line probably; it may have been a roofing square); under the top part of the ruler, a collection of protractors, a telescope, dividers, and other engineering and mathematical instruments.
The article headed by this picture is about the Roussel Collection: a collection of mathematical instruments. The collection appears to have been made in the eighteenth century; the drawings are attributed to Madamoiselle J. Roussel, which could be a wife or daughter.