A vintage set of large, drawing compasses produced by the Reifler Mathematical Instrument Company in Nesselwang, Germany. This company produced a large variety of draftsman’s tools. This R2 model has extension rods to allow usage up to a diameter of 107 cm (42 “) and was used by Bill McAlpin, the designer of the neutron diffraction spectrometer used by B. Brockhouse for his Nobel prize-winning work as well as many other neutron spectrometers at Chalk River. The compass set is housed in a leatherette case which is 46 cm long and 11 cm wide.
