Search Loci: Convergence:
Time was when all the parts of the subject were dissevered, when algebra, geometry, and arithmetic either lived apart or kept up cold relations of acquaintance confined to occasional calls upon one another; but that is now at an end; they are drawn together and are constantly becoming more and more intimately related and connected by a thousand fresh ties, and we may confidently look forward to a time when they shall form but one body with one soul.
Presidential Address to British Association, 1869.
This Italian compass of the 15th century displays a high level of workmanship. Its scales allow for conversion of Roman linear measuring units to other contemporary systems. The compass was more than a mere measuring instrument, it was a computing device.