At the present time constructors almost always employ the inverse method: they compose a system from certain, often quite personal experiences, and test, by the trigonometrical calculation of the paths of several rays, whether the system gives the desired reproduction (examples are given in A. [Please select]
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Who shall adjust the machinery in elevators--the Machinists or Elevator Constructors. [Please select]
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How wrong this surmise was we know, and it serves to show how very wide of the mark it is possible for the constructors of a theory to steer. [Please select]
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