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[map] AIR NAVIGATION MAP NO.63 (Experimental) Population More than 500,000 BOSTON " " 100,000 TRENTON " " 25,000 Orange " " 5,000 DOVER Less " 5,000 Rockville EXPLANATION (column 1) (symbol)Main highway (symbol) Ties 5 mi Railroad, one track (symbol) Ties 5 mi Two or more tracks (symbol) Ties 2 1/2 Railroad, electric (symbol) City or large town (symbol) Town or village (symbol) Race track or fair grounds (symbol) Ordnance depot (symbol) Prominent transmission line 0 to 1000 2000 feet (symbols) GRADIENT OF ELEVATIONS Datum is mean sea level Column 2 (symbol) Joint Occupation-Government, Municipal or Commercial Field (symbol) Army, Navy, Marine Corps Field (symbol) Commercial or Municipal Field (symbol) Department of Commerce Intermediate Field (symbol) Marked Auxiliary Field (symbol) Seaplane base with ramp, beach and handling facilities (symbol) Anchorage with refueling and usual harbor facilities SALEM Cities have name painted on prominent roof or tank (symbol) Obstruction (numerals indicate height in feet above ground) 1/1000000 10 0 10 20 30 40 50 miles (symbol) INFORMATION DIVISION OFFICE CHIEF OF AIR CORPS 1933 ENGINEER REPRODUCTION PLANT, U.S. ARMY, WASHINGTON, D.C. RED INFORMATION REVISED MAY 1933 Column 3 (symbol) Airport light beacon without code light (within airport symbol) (symbol) Airport light beacon with code light (within airport symbol) (symbol) Airway light beacon, rotating (Arrows indicate course lights) (symbol) Landmark light beacon without bearing projector (symbol) Landmark light beacon with bearing projector (Arrows indicate fixed beam pointing to airport) (symbol) Auxiliary airway light beacon, flashing (symbol) Auxiliary airway light beacon, code flashing (within airport symbol) (symbol) Lighthouse (symbol) Lightship R red G green W white NOTE: Airway aids are operating on part time schedule. All aids to air navigation at present are subject to change. For such changes as have been made since date of publication of this map, see Air Commerce Bulletins published semi-monthly by the Aeronautics Branch of the Department of Commerce. [map] WASHINGTON, D.C. TO BOSTON, MASS. Column 4 RADIO RANGE (symbol) Bearings are Magnetic (symbol) Radio range beacon (symbol) Combined radio range beacon and weather broadcast station (symbol) Weather broadcast station Effective range approx. 100 miles (symbol) Frequency in kilocycles Identifying signal (symbol) Time of weather broadcast after the hour (symbol) Radio station calls (symbol) Marker Beacon Class A (non-directive) Effective range approx. 10 miles Class B (directive) Effective range approx. 50 miles Magnetic variations shown by red arrows 2654:41/76:43