fusion in the selection of these diaphragms in making requisitions for repair parts, the following tables have been prepared:

Standard fire-control instruments.

Single head receiver, leather cover, made by the W. E. Co__.

Hand receiver, W. E. Co‒‒‒‒

Hand receiver, North Electric Co__

Hand receiver, Dean Electric Co---)

Watch-case receiver, head set_.
Watch-case receiver, hand set__.

Watch-case receiver, double head_

Special fire-control instruments.

Cable-testing telephone----

216

All Lambert Schmidt head receivers, watch-case type, made for artillery use in 1904–5_.

Special flat hand set of W. E. Co., made in 1904

21 21

Article VIII.

MISCELLANEOUS EQUIPMENT.

RIFLE-RANGE EQUIPMENT.

464. Signal corps supplies for target ranges differing from the standard herewith set forth will not be furnished except on the special approval of the Chief Signal Officer of the Army for reasons which must be satisfactory to the Chief of Staff.

It is assumed that ranges will be equipped with targets varying in number from two to twenty-four and that the purpose of the telephone communication is to enable men firing to communicate with the markers on such occasions as may be necessary to note a failure to mark, a miss, an improper position of the target, or other incidental events not requiring any extended or considerable amount of conversation over telephones on the range.

Ranges are divided into two classes the first having a width of more than 100 yards, and the second class a width of 100 yards or less. First-class ranges will have the range office connected with the target pits by two single-pair lead-covered cables, one at the right side and the other at the left side of the range. The cables are to be buried in a trench not less than 15 inches deep and covered first with a board at least 1 inch thick and 6 inches wide, and then with earth.

Each firing point (at 100 yards, 200 yards, etc.) will be provided with an outlet box for the purpose of furnishing telephonic communication with any desired point on the range. Local connections are to be made by a flexible cord, one twisted pair, of sufficient length to permit a field telephone to be carried to any desired position on the firing point.

Telephones with plug will enable the range officer to establish communication between the range office, the target pits, and any firing point on the range where practice may be taking place.

Ranges of the second class, 100 yards or less in width, will be equipped in the same manner, except that one cable only will be furnished.

There will also be suitable stationary boxes to protect telephones placed in the rear of the targets and portable boxes for protecting the field telephones while they are being used on the firing line, the latter boxes to hold the portable cord when not in use.

[21766]

W. Welch, March 1904