SIGNS—FIELD MAPS AND SKETCHES.
| Telegraph Line | Symbol (modified below) |  |
| Along improved road |  | |
| Along unimproved road |  | |
| Along trail |  | |
| Railroads | Single track |  |
| Double track |  | |
| Trolley |  | |
| Roads | Improved |  |
| Unimproved |  | |
| Trail |  | |
| Fences | barbed wire |  |
| smooth wire |  | |
| wood |  | |
| stone |  | |
| hedge |  | |
| Bridge |  | |||||
| Indicate character and span by abbreviations. | ||||||
| Example: |  |  | ||||
| Meaning wooden kingpost bridge, 40 feet long, 20 feet wide, and 10feet above the water. | ||||||
| Streams |  | |||||
| Indicate character by abbreviations. | ||||||
| Example: |  | |||||
| Meaning a stream 15 feet wide, 8 feet deep, and not fordable. | ||||||
| House |  | Church |  | School house |  | |
| Woods |  | Orchards |  | Cultivated Land |  | |
| If boundary lines are fences they are indicated as such. | ||||||
| Brush, crops or grass, important as cover or forage |  | |||||
| Cemetery |  | Trees, isolated |  | |||
| Cut and fill— |  | cut 10 feet deep | ||||
 | fill 10 feet high | |||||
Map.
CHAPTER XI.
MESSAGE BLANKS.
| U. S. ARMY FIELD MESSAGE. | No. | Sent by. | Time. | Rec'd by. | Time. | Check. |
| (These spaces for Signal Operators only.) | ||||||
| Communicated by Buzzer, Phone, Telegraph, Wireless, Lantern, Helio, Flag, Cyclist, Foot Messenger, Mounted Messenger, Motor Car, Flying Machine. Underscore means used. | [Name of sending detachment.] | |||||
| From | ||||||
| At | ||||||
| Date | Hour | No | ||||
| To | ||||||
| Received | ||||||
The heading "From" is filled in with the name of the detachment sending the information: as "Officer's Patrol, 7th Cav." Messages sent on the same day from the same source to the same person are numbered consecutively. The address is written briefly, thus: "Commanding officer, Outpost, 1st Brigade." In the signature the writer's surname only and rank are given.