When a clause to the effect that "The work shall be under the general supervision of the architect, whose decision as to the true intent and meaning of the drawings and specifications will be final and conclusive." or any other salvation clause of like purport, appears in a specification, it is a written confession that the person who prepared the plans and specifications in question did not understand his business, knew his limitations, and is trying to protect his ignorance by hedging himself around with a number of clauses which, in matters of dispute, vest him with unlimited arbitrary authority to decide the case in his own favor, regardless of the merits or justice of the case. If plans are properly prepared and specifications capably written there will be no question as to their true intent and meaning; if they are not clear and explicit, it is the construction put upon them by the reader, not the writer, which should be final and conclusive. The designer in preparing his drawings and specifications knows, or ought to know, what he wants to show and describe. Having this knowledge and ample time at his disposal, he is supposed to have made a record of his desires. If through ignorance or lack of ability he fails in his effort, he alone is the one who should stand responsible for the failure. Such designers, however, usually try to shift the responsibility to the contractor by reserving to themselves unlimited arbitrary power, concealed in innocent-looking salvation clauses similar to the one quoted. When an estimator is given a set of drawings and a specification on which to base his estimate for work, he is justified in believing that the architect or engineer has expressed himself fully and clearly in his work. He cannot read the designer's mind to learn what was intended, but must base his estimate upon his interpretation of the drawings and specifications furnished him. If the designer had one thing in mind, but unable to express it, has conveyed an entirely different impression, or has left much unsaid and undrawn which he had planned in his mind to show and state, the contractor should not be called upon to include such work and material in the contract as fully as though shown by the plans and described in the specifications, but this he can be made to do under the salvation clauses of ignorant or dishonest architects or engineers.