90 x 45 x 45 set square. There are two wood types with the edging very likely to be mahogany. The paler wood may be maple. The “figure of eight” keys used to make the square are not generally found on UK squares, the square may therefore, be continental or American. There are no marks on the square. Manufacturer unknown.
This item belonged to the donor’s father John Walker who was awarded a Higher National Certificate in Electrical Engineering by Heriot-Watt College in 1951. To see John Walker’s HNC Certificate click here.