Vac Aero International, Oakville, Ontario, Canada, received an order from Tri - Industries Inc., Terre Haute, Ind., for a vacuum furnace with a working zone of 72 in. diameter by 72 in. high, graphite felt lined hot zone and 35-in. diffusion pump. The order includes Stokes mechanical pumping system, Honeywell and Allen Bradley controls, a Televac vacuum instrument and water system. Vac Aero personnel will perform complete assembly and installation.