(a) Value of the product, process, machine or device, as measured by its usefulness, its beneficent influence on mankind in its physical, mental, moral, and educational aspects. Counting not to exceed 25. (b) Skill and ingenuity displayed in the invention, construction, and application. Counting not to exceed 25. (c) Merits of the installation as to the ingenuity and taste displayed, the cost and value as an exposition attraction. Counting not to exceed 10. (d) Magnitude of the business represented, as measured by the gross sales during the calendar year preceding the opening of the exposition. Counting not to exceed 10. (e) Quality or cheapness, with reference to the possession by the exhibit of the highest possible quality, or the fact that the article is sold at so low a price with reference to its quality as to make it a valuable acquisition to the purchaser. Counting not to exceed 10. (f) For completion of installation within required time and for excellence of maintenance. Counting not to exceed 10. (g) Length of time exhibitor has been in business as showing whether exhibit is a development of original invention or is an improvement on the work of some prior inventor. Counting not to exceed 5. (h) Number and character of awards received from former expositions. Counting not to exceed 5. 25. A special award, consisting of a gold medal in each department, may be recommended by the department jury for the best, most complete, and most attractive installation. 26. The following scale of markings shall be used in determining the final merits of an exhibit and fixing the award that should be made, 100 being used as indicating perfection: Exhibits receiving markings ranging from 60 to 74 inclusive, bronze medal. Exhibits receiving markings ranging from 75 to 84 inclusive, silver medal. Exhibits receiving markings ranging from 85 to 94 inclusive, gold medal. Exhibits receiving markings ranging from 95 to 100 inclusive, grand prize. 27. The diplomas or certificates of award for exhibitors shall be signed by the president of the Louisiana Purchase Exposition Company, the president of the Louisiana Purchase Exposition Commission, the secretary of the Louisiana Purchase Exposition Company, the director of exhibits, and the chief of the department to which the exhibit pertains. 28. Special commemorative medals and diplomas may be issued to the officers of the exposition, to the United States, State, and foreign commissioners, to the members of the international jury of awards, and to such other persons as may be deemed worthy of special recognition. 29. The compensation of foreign jurors shall be fixed and paid by the countries which they respectively represent.