Where necessary to tamp the tie after respacing add the following to the above schedule:

If only cross-tamping is done, use one-half the above scheduled hours for tamping.

(5) PLANS AND SPECIFICATIONS FOR SWITCH STANDS, SWITCH LAMPS AND SWITCH LOCKS

In Appendix A, Item II, plan 252, covering details of lamp tips for switch stands, is submitted for adoption as a supplement to the Manual, completing Section 12 of Requisites for Switch Stands, including Connecting Rods, adopted March, 1921.

The plan showing shapes and sizes of targets, No. 253, dated November, 1921, to complete Section 11 of Requisites for Switch Stands, including Connecting Rods, is presented with the Committee's recommendation that it be accepted as information only.

Your criticism of this plan is invited, that it may be considered for revision if found desirable and resubmitted next year for adoption. It was found there are at present in service a great variety of dimensions of the same shape or style, the dimensions in some instances varying by only a fraction of an inch, each set of dimensions requiring individual dies. Hence, an effort has been made to standardize the dimensions of styles in most common use and show a sufficient variety of shapes and sizes to meet various operating requirements. After consultation with the A.R.A. Signal Section it was found they had no standard target shapes, their only standard being a 10-inch target disc for attachment to switch lamps.

The Committee submits plan No. 254 of 10-inch and 9-inch day target discs for attachment direct to switch lamps for low and extra low switch stands, and recommends that it be adopted as standard. This is an outline plan only and conforms to dimensions on A.R.A. Signal Section plan No. 1445 for the 10-inch day disc, to which reference is made for further details.

The Committee also recommends that the following A.R.A. Signal Section plans of switch lamps be approved and endorsed without publication in our records:

Plan 1440 Switch lamp (spherical type), approved March, 1921. Plan 1441-Switch lamp base-socket for spherical type switch lamp (Plan 1440), approved March, 1921.

Plan 1442-Lens, hoods and couplings for switch and semaphore lamps (see plans 1440 and 1460), approved March, 1921.

Plan 1443-Oi! fount for spherical type lamp (Plan 1440), approved

March, 1921.

Plan 1460-Switch lamp (cylindrical type).

Plan 1461-Switch lamp base-socket for cylindrical type switch lamp

(Plan 1460).

It is the opinion of the Committee that a further investigation should be made with a view of recommending an additional design of lamp, of reduced height, for use with low and extra low switch stands and for close clearances.

The subject of switch locks has been investigated, but the Committee is not yet ready to make a report.