The Twelvetrees Calculator
- Made:
- circa 1911 in Manchester
- maker:
- J Halden and Company Limited
- inventor:
- Walter Noble Twelvetrees
Calculator, The Twelvetrees Calculator for reinforced concrete beams, for estimating compressive versus tensile strength, invented by W. Noble Twelvetrees, made by J. Halden & Co. Ltd., housed in velvet lined leather carrying case, includes instruction manual, ex Hull Joint Dock Committee.
Details
- Object Number:
- 2005-7395
- Materials:
- ivory, wood (unidentified) and brass (copper, zinc alloy)
- type:
- calculator
- credit:
- Bastin, Roger