In Appendix A are given the changes and addition to the section of the Manual assigned to this Committee. This report is brief because of the intensive work done by this Committee last year in anticipation of the publication of the new Manual.

(2) Wooden Trestles-Open-Deck, Multiple-Story and Ballast-Deck In Appendix B-Exhibits 1, 2, 3, 4, 5, 6, the Committee reports on subject No. 2, which has been before this Committee for two years for investigation and study. The Committee's recommendations are given under the heading of Conclusions.

(3) Fireproofing Wooden Bridges and Trestles

In Appendix C the Committee submits report on subject No. 3 and its recommendations are given under the heading of Conclusions.

CONCLUSIONS

1. The Committee recommends that the changes and additions to the Manual as given in Appendix A be approved.

2. The Committee recommends that the plans for standard OpenDeck Pile Trestles, Light Design, as shown in Appendix B, Exhibit 1, be approved for printing in the Manual as recommended practice.

3. The Committee recommends that the plans for standard OpenDeck Pile Trestles, Heavy Design, as shown in Appendix B, Exhibit 2, be approved for printing in the Manual as recommended practice.

4. The Committee recommends that the plans for standard Open-Deck Frame Trestle, Light Design, as shown in Appendix B, Exhibit 3, be approved for printing in the Manual as recommended practice.

5. The Committee recommends that the plans for standard OpenDeck Frame Trestle, Heavy Design, as shown in Appendix B, Exhibit 4, be approved for printing in the Manual as recommended practice.

6. The Committee recommends that the plans for standard MultipleStory Trestles, as shown in Appendix B, Exhibit 5, be approved for printing in the Manual as recommended practice.

7. The Committee recommends that the plans for standard BallastDeck Trestles, as shown in Appendix B, Exhibit 6, be approved for printing in the Manual as recommended practice.

8. The Committee recommends that the recommendations as good practice in the report of the Sub-Committee on fireproofing wooden bridges and trestles, as given in Appendix C, be approved for printing in the Manual.

9. The Committee recommends that the outline of work for the ensuing year be received as information for the use of the Committee on Outline of Work.

10. The Committee submits in Appendix B, Exhibits 7, 8, abstracts of data and questionnaires, as information.

Outline of Work for Next Year's Study and Report

A. O. RIDGWAY, Chairman; W. H. HOYT, A. M. VAN AUKEN, C. S. HERITAGE, H. AUSTILL, Sub-Committee.

1. Report on classification and grading rules for hardwood timber and lumber for railroad purposes.

2. Study and report on the useful strength of new, old and treated timber when used in railroad trestles, including a critical examination of the present theories of stresses when applied to timber under railroad load conditions.

3. Study and report on proper organization of Bridge and Building Departments.

4. Study and report on system of trestle inspection and reports covering the same.

Respectfully submitted,

THE COMMITTEE ON WOODEN BRIDGES AND Trestles,

W. H. HOYT, Chairman.

Appendix A

(1) REVISION OF MANUAL

A. O. RIDGWAY, Chairman; H. T. HAZEN, D. W. SMITH, SubCommittee.

Your Committee recommends the following changes in the Definitions, now in the Manual:

BALLAST CURB-A longitudinal timber placed along the outer edge of the floor on ballast deck bridges to retain the ballast.