should be extended so as to secure the cleaning and painting at the proper time, and under correct conditions, in order to save cost in labor, time, and materials of repainting, either at the shop or in the field. The inspection should cover such co-operation with the management as to secure good work with the least expense to the manufacturer, and the shipment of the finished product at the time and in the order necessary for expeditious and economical erection.

Much that is stated in Chapter II, under the heading "Economics of Mental Effort," is important to apply to the service of inspectors as well as to that of the Designing Engineers. It would be well for the Inspection Firms and the Supervising Inspectors to study and practice the considerations referred to therein, and apply the knowledge gained to the selection and direction of their inspectors actually performing the duties. The inspectors should be selected not only for their experience but for temperament to fit them for the very important duty of co-operation with manufacturers; also with regard to their health and habits. In all cases where inspectors have demonstrated their fitness and loyalty to the employer's interests, the direction of the work should be handled with every consideration for the employee that is consistent with the nature of the work and with other conditions affecting the clients' interests. This relation between Inspecting Engineers and their employees in charge of work affects directly the character of the service and, therefore, the economics of inspection.

The inspection in the field of the placing of foundations, the building of masonry, and the erection of metalwork needs, from an economic viewpoint, the same consideration as does the manufacture of the bridge superstructure. The inspectors should be men of experience; their duties should be so laid out as to promote the progress of the fieldwork, and prevent the rejection and rebuilding of portions of the work; their idle time should be applied to other features of the project when the actual fieldwork does not demand their attention; and they should be subject to the same considerations of the "Economics of Mental Effort."

In general, it can very properly be considered poor economy to have given attention to the economics of promotion and secured competent design and specifications, and not to have provided for inspection to make sure of the entice manufacture and erection being performed in strict compliance with them; or to have had incompetent inspection by persons inexperienced and without proper organization; or to have failed to secure a fair and reasonable compensation for Inspecting Engineers fully qualified by experience and organization to perform the required service in a manner commensurate with its importance.