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Generalized design techniques are presented for the cam-link mechanism which is a fundamentally new and different kinematic chain capable of structural error-free operation for both path and function generation. These design techniques, employing an optimization procedure, provide a systematic approach to the design of mechanisms for function and path generation when extreme accuracy is required and when severe design restrictions must be accommodated. Examples are worked to demonstrate application of these procedures and to illustrate the nature and capabilities of the cam-link mechanism.

An "emergency" wooden respirator can be made and assembled in a few hours from materials usually found in any community having a lumber yard, hardware store and garage or small machine shop. This respirator can be built by a carpenter or cabinet maker with some assistance from a sheet metal worker, blacksmith or garage man or a high school manual training class. The materials listed should be available in any small community. This is particularly true if the respirator is to be operated by hand. If it is desired to operate the respirator by motor, a washing machine agitator mechanism or a combination of belts and pulleys having a total reduction ratio of 120:1 from the motor to the cam link may be employed. This ratio is important to give the proper respiratory frequency of 12 to 20 cycles a minute. A pamphlet which graphically sets forth its construction has