Show The use of aluminum in punching press construction is being tried in order to secure secure secure se se- cure high speed operation A press has recently recently recently re re- re- re been built by the Standard Standard- Machinery Machin Machin- ery company of Providence for tor notching laminated armature discs which is capable of making strokes a minute By the use of aluminum the weight of the plunger and connections was reduced sufficiently to permit this speed or even strokes per minute to be maintained continuously o |