“Quick set” beam compass/trammel made by WH Harling Ltd (c.1930), London consisting of a wooden beech(?) beam and two trammel points each bearing the maker’s name. The top of the beam is grooved to allow the trammels to be positioned by rotating the knurled wheel at the top of each trammel (see Image 2).
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.