Rare Books

The vse of the two mathematicall Instruments, the crosse staffe, (differing from that in common vse with the mariners:), and the iacobs staffe: : set foorth dialogue wise in two briefe and plaine treatises: the one most commodious for the mariner, and all such as are to deale in astronomicall matters: the other profitable for the surueyor to take the length, height, depth or breadth, of anything measurable