Details
A spirit-level and calipers:
an ebony spirit level, the phial in engaged cylindrical brass tube with rotating cover -- 12in. (30.5cm.) long; a small, slender wrought-iron pair of calipers with brass pivot pin -- radius 4in. (10cm.); and the upper part of a wing compass, engraved twice J.W, with triangular sockets in each arm and additional pencil clamp on one (3)

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