In the past fifty years of research by scholars at the Archaeological Research Facility instrumentation has changed dramatically. A number of historic instruments on are display at the ARF.

	Buff & Buff Transit Model 2C Produced: 1930 (approx.) Optical tube length:  25.4 cm (10") Serial: 25574
	Keuffel & Esser Wye Level 20" Extra Fine Engineers Model: 5012 Produced: 1908 Optical tube length:  51.5 cm (20 1/4") Serial: 16516
	W. & L.E. Gurley 1510 no. L 18 Inch Engineers Wye Level Model: 377 Produced: 1915 Optical tube length: 49.2 cm (19 3/16") Serial: 151090
Thanks to Robert Parrish of Antique Surveying Instruments for information about our instruments.