Abstract: A method and apparatus for creating an orthodontic archform wherein the bracket archwire slots are level to one another. The method includes setting up separated model teeth in a straight line on a setup fixture to locate the brackets in a level position on the model teeth, transferring the model teeth and brackets to an alignment fixture, and positioning them in a curved arrangement defining an archform. An archwire can then be formed in the bracket slots either manually or by inserting and clamping the archwire in the slots and heat treating the archwire in an oven.

Abstract: A method and apparatus for determining exhaust backpressure in which a bore is created in the wall of a manifold, pipe, muffler, of the like which is in fluid communication with an exhaust port of an internal combustion engine. A pressure-indicating device of the type having an elongate probe is inserted through the bore in unsealed and unthreaded relation therewith. After reading the backpressure indicated by the device, the probe is withdrawn and a plug is frictionally engaged with the bore thereby sealing against exhaust leakage.