delivered the opinion of the court:
The transcript of the record in this cause contains 1881 pages. The printed abstract filed by plaintiff in error contains 529 pages. Defendants in error complain of the abstract as being incomplete and misleading, but as they have not filed a further abstract, the one on file will be taken by us “to be accurate and sufficient for a full understanding of the questions presented for decision.” (Rule 14 of the Rules of Practice of this court.)
The principal controversy is over a claim presented by . plaintiff in error for work which it deems to be extra work performed upon the elevator screens and stairway balustrades in the annex to the Marshall Field building in Chicago, which is used as a retail store.
• The document originally signed by the plaintiff in error provided that the work should be executed “according to drawings and specifications prepared by D. H. Burnham, * * * signed by contractor hereto and made a part hereof.” Those drawings are referred to as scale drawings, and were used as a basis for the bid. They were drawn upon the scale of one-half inch to the foot and showed the outline of designs for screens and balustrades for the first story only, and showed that there were to be at certain indicated points ornamental features, such as leaf work, but did not show the character, quality or extent of such work, and the specifica= tions did not help the drawings in this respect.
*449At and before the time of the signing of the contract as originally drafted, there were in the office of Burnham, the architect, photographs of elaborate ornamental iron work that had been executed in Europe, also a sample section of highly ornamental iron grille work. Mr. Perkins, superintendent for Burnham, acted as the agent of Field in negotiating with plaintiff in error a contract after the bid had béen accepted. These negotiations extended over several days, and the contract as originally drafted covers nine pages in the printed abstract. After plaintiff in error, by William R. Snead, its general manager, had signed it and had signed the drawings and specifications, Perkins presented to Snead certain of the photographs and asked that he sign the photographs as illustrative of the ornamental iron work that was to be done on the balustrades and elevator screens. The general manager refused to do this. It is contended that plaintiff in error, by its agents, had, prior to the time it made its bid, inspected the photographs and the grille with the understanding that they were of the same general character as the ornamental work which the successful bidder would be required to do on the screens and balustrades. As to whether or not this statement is true the evidence is conflicting, but the contention of plaintiff in error in that respect finds substantial support in the fact that the work which the architect finally required it to do was much less expensive and less elaborate than that shown by the grille and photographs in question. It is entirely manifest, moreover, that when the photographs were presented to Snead to be signed by him for the purpose of identification, as showing the character of the work required, he, Snead, said he did- not bid on elaborate work like that, and that if the architect required work of that kind, he, Snead, would have nothing to do with it.- These photographs showed iron work ornamented with garlands of fruit and figures of cherubs. When Snead first refused to sign, Perkins said the “fruit and babies” could be eliminated, but Snead protested that the work would *450then be more elaborate than that which he had understood would be required.
With the negotiations in this state, Snead having, for his company, signed the contract as originally drafted and having signed the drawings and specifications and having refused to sign the photographs, left Burnham’s office and went to luncheon with Perkins. After they left the office negotiations continued between them. Snead stated to Perkins the amount that he had figured in the bid to cover the balustrades and elevator screens, as he understood they were to be constructed in accordance with the scale drawings, and said, in substance, that if balustrades and elevator screens were to be required that could not be furnished at those figures he did not desire to enter into the contract. They separated without coming to any agreement, and on the sanie day Snead wrote to Perkins, and on that day or the next morning Perkins received, the letter which is set out in the foregoing statement.
Shortly after the original draft of the contract had been signed by Field, plaintiff in error entered upon the performance of the contract and furnished the balustrades and elevator screens in accordance with full-sized detail drawings thereafter furnished him by Burnham, protesting, from time to time, however, that the character of the work was more elaborate than the contract contemplated, and that it was not covered by the contract and for that reason should be regarded as extra work. The ornamental features consisted of leaves, buds, fruits, vines and various artistic figures which were not indicated by the scale drawings, and some of which necessitated hand work by skilled iron workers.
It is plain that the scale drawings were too indefinite to enable the contractor to determine what was required, and that the contract as originally drawn was in that respect ambiguous and uncertain. Had the photographs or specimen of grille work been made a part of the contract, by reference or otherwise, the ambiguity would have been re*451moved, or if the letter of November 23 is to be regarded as a part of the contract, then, for the purpose of this litigation, the ambiguity is likewise removed, because in that event the value of the stairway balustrades and the elevator screens as they were made and placed in the building by plaintiff in error, in so far as they exceed in value the amounts stated in that letter as being the value of that work as contemplated by the bid, is recoverable by plaintiff in error from defendants in error, on the theory that the amount of that excess is the value of extra work on the screens and balustrades.
Defendants in error first contend that the grille and photographs should be considered for the purpose of enabling the court to understand what the parties wrote in the contract, as they understood it at the time. This cannot be, as it is evident that plaintiff in error never consented that the photographs or grille were illustrative of the work that was to be furnished or had any connection therewith, and such consent was a necessary preliminary to their being so regarded.
Defendants in érror also argue that it is almost impossible to make the scale drawings and specifications show the details of the work or even indicate fully its character and value, but that they always need to be, and are, supplemented, and that they may be supplemented by enlarged sketches on the margin of the scale drawings, or by reference to known and existing specimens of similar work, or by reference to photographs of such work. This reasoning is sound, but where specimens or photographs are relied upon to supplement the scale drawings they should be identified as a part of the contract or as illustrative thereof, so that there could be no question that they were used to supplement the scale drawings. In this case there was no such marginal sketch and no such specimen or photograph was so identified. In this condition of the record it is contended that the scale drawings may be supplemented by “the general standing of the architect and the usual character of his work, *452the richness or simplicity of the building in general and the purposes' for which it is designed.” If the argument last mentioned is entitled to any consideration at all, it may be observed that in this case detail drawings were furnished after the contract was entered into, from which plaintiff in error was able to ascertain, without any difficulty whatever, precisely what the architect wanted. There is no legal reason why such detail drawings should not have accompanied the contract in the first instance and made it certain, without leaving the parties to determine their rights by so doubtful a measure as that afforded by the general standing of the architect and the usual character of his work, or by the richness or simplicity of the building in general and the purposes for which it was designed.
It is contended by the defendants in error that the scale drawings themselves are not definite and certain, and that under the contract the architect has the power to determine the true construction and meaning thereof; and • further, that the architect did determine the meaning of the scale drawings and furnished the detail drawings in accordance with such determination, and that the ambiguity in the contract is thereby cured. In that view of the matter the contract was not only. ambiguous, but it was blank and meant nothing so far as it was evidenced by the scale drawings. The difficulty about this contention is, that with the scale drawings in the condition they were when the original draft of the contract was signed by Snead, no one could tell what was required, and if that was to, be ascertained some months later by the architect, and he had the power to require screens and balustrades that would be of the value of $20,-000, or that might exceed $50,000 in value, without any increase or decrease in the contract price for all the iron work, which was $88,643, there was no meeting of the minds of the parties and the contract was void for that reason.
When Burnham acted as arbitrator, he determined, as he testifies, that the photographs and grille were a part of *453the contract and so considered them, and determined that the letter of November 23 was not a part of the contract and refused to consider it. Counsel for defendants in error say that the testimony of Burnham in this respect resulted from the fact that certain words were put into his mouth by cross-examining counsel. From Burnham’s testimony, as set out in the abstract, we are of the opinion that he was not misled by the cross-examiner; that he understood the significance of the language used when he said, “I considered that the photographs and the scale drawings and the specifications, as well as the grille, * * * were part and parcel of Snead & Co.’s undertakingand, “I did not consider the letter to be a part of the contract.” For reasons already pointed out, the architect, when acting in his capacity as arbitrator, was mistaken in concluding that the photographs and the grille work were any part of the contract.
At the time of the signing of the original draft of the contract it became evident that its ambiguous and uncertain provisions were differently interpreted by plaintiff in error and Field’s agent, and, following a discussion between them, plaintiff in error wrote the letter of November 23, advising the agent, which was notice to Field, of the construction which plaintiff in error placed upon the contract as originally drafted. Field signed the original draft, and one copy of it was returned to plaintiff in error through the mail by the architect without anything further being said to the Snead company in reference to its letter or the meaning of the contract as originally drawn. Under these circumstances, in view of the ambiguity and uncertainty of the contract, plaintiff in error had the right to assume that its construction thereof had been assented to.
“The true principle of sound ethics is to give the contract the sense in which the person making the promise believed the other party to have accepted it, if he, in fact, did so understand and accept it.” Wells v. Carpenter, 65 Ill. 447.
*454“Where the contract is, in fact, understood by one of the parties in a certain sense, and the other party knows that he so understands it, then the undertaking is to be taken in that sense, provided this can be done without making a new contract for the parties.” Street v. Chicago Wharfing Co. 157 Ill. 605.
We conclude, therefore, that the letter of November 23 must be regarded as part of the contract in sp far as it gives meaning to the original draft of the contract in reference to the value of the stairway balustrades and elevator screens that were to be furnished and put in place by the plaintiff in error.
It is argued that under provisions of the contract set out in the foregoing statement the architect’s award is conclusive. It is manifest that the architect, in making his award, exceeded his jurisdiction by regarding that as. a part of the contract which was not a part of the contract and in giving Field the benefit' thereof, and that he excluded from consideration, as not being a part of the contract, that which should have been regarded and treated as a part thereof. In other words, the rights of the parties which he attempted to adjudicate were not the rights which were submitted to him for arbitration. His finding was in reference, in part, to matters not submitted to him and disregarded other matters which were submitted to him. He departed from the authority conferred upon him by the contract, and his award being an entirety, is therefore not binding and is wholly in-. effectual. Tucker v. Page, 69 Ill. 179; Sherfy v. Graham, 72 id. 158; Alfred v. Kankakee and Southwestern Railroad Co. 92 id. 609; DeGroot v. United States, 5 Wall. 419; Skipworth v. Skipworth, 9 Beav. 135; Thrasher v. Haynes, 2 N. H. 429; Chase v. Strain, 15 id. 535.
After the contract had been completed, and before the final certificate was issued, plaintiff in error, through Udolpho Snead, its president, and W. R. Snead, its general manager, sought to adjust the matter personally with Mr. Field, and *455defendants in error, summarizing the result of the attempted negotiations with Mr. Field, state that Mr. Field said that “he knew nothing about it and that the whole matter was in the hands of Burnham.” When the architect was considering the rights and claims of the parties, his superintendent, Perkins, acting for Field, made a claim against plaintiff in error for delay in the completion of the work. The contract provided that delay occasioned by certain matters should not be considered, and .several days were deducted from the de.lay on account of those matters, and plaintiff in error contended that the remainder of the delay was occasioned by the failure of Burnham to furnish the detail drawings at the proper time. The evidence strongly tends to show that this was the case. It became, then, a question whether Burnham or plaintiff in error was responsible for the delay. If Burn-ham was so responsible the delay was the delay of Field, and plaintiff in error would not be liable for damages by reason thereof. Burnham proceedéd to determine this question with Perkins, his superintendent, seeking to show that the fault was not Burnham’s. Perkins was successful. The decision was adverse to the Snead company.
■ Plaintiff in error unsuccessfully sought a decree for several smaller amounts, which are referred to in the litigation as “minor disallowances.” We have examined the evidence pertaining to these. At least one of them was not a proper charge against Mr. Field in any event. As to some of them plaintiff in error did not properly preserve its right with reference to the adverse action of the master, and the others are without merit.
The judgment of the Appellate Court and the decree of the circuit court will be reversed and the cause will be remanded, with directions to the circuit court to sustain the exceptions to the master’s report which, when filed originally as objections, were numbered, respectively, 3, 24, 26, 27, 28, 29, 35, 37, 38, 41 and 42, being the exceptions questioning the finding of the master in reference to the elevator screens *456and stairway balustrades, in reference to the delay and in reference to the conclusive character of the architect’s findings. The circuit court is further directed to disregard entirely the award of the architect in reference to the elevator screens and the stairway balustrades and the damages occasioned by delay, and to ascertain the value of the stairway balustrades as placed in the building by plaintiff in error, and if that value exceeds the sum of $4800, to award, by final decree, the excess to plaintiff in error as a sum due and unpaid, and to ascertain the value of the elevator screens as placed in the building by plaintiff in error, and if that value exceeds the sum of $15,000, to award, by said final decree, the excess to plaintiff in error as a further sum due and unpaid, and to ascertain whether any sum is chargeable against plaintiff in error, under the contract, for delay, and if not, to award to plaintiff in error, by said final decree, the further sum of $3900 as money due and unpaid, but if it be found that some amount is chargeable for damages on account of delay, to ascertain the amount, and if that amount is less than $3900, to award to the plaintiff in error, by said final decree, the amount of such deficiency as a further sum due and unpaid, but if the court should determine that the amount of damages occasioned by delay exceeds the sum of $3900, then such excess may be deducted from any allowances made by the court on account of the stairway balustrades and the elevator screens. Proof already taken, so far as material, shall be considered by the court, and by the master if there be a re-reference, and such proof shall not be re-taken, but the circuit court may, if justice requires, permit the taking of further evidence, by either party, material to the questions to be determined by the circuit court in following the directions by this opinion given.
Reversed and remanded, with directions.
Mr. Justice Carter, dissenting.