178 M. Baker—Surveys and Maps, District of Columbia. 
[1894.] United States Coast and Geodetic Survey. Topographical 
map of the District‘of Columbia. Sheet No.1. Scale, 1:4800. The 
contour interval is 5 feet. The datum plane is 0.807 feet above half-tide 
level of the Potomac river. 
’ 
Size, 15 x 16inches. Secale, 400 feet to an inch, or 1:4800. 
Engraved upon copper by Evans and Bartle, Washington, D.C. Printed by the 
Norris Peters Lith. Co., Washington, D. C. 
In four colors, viz., culture, black; drainage, blue; contours, brown, and wood- 
land, green. 
The above is one sheet of the very elaborate map begun by the Coast Survey in 
1880. It covers one square mile, and 100 such are required to cover the original 
District of Columbia. Under the scheme of numbering now adopted the Distriet 
is divided into 100 squares by lines parallel to its boundaries. The northeastern 
row of ten sheets is numbered from the northern corner to the eastern corner 1 to 
10; the second row, 11 to 20; the third, 21 to 30, and soon. Some 30 to 35 of these 
sheets are said to be now engraved, but none are published. The compiler has 
seen proofs of sheets 1, 2, 22, and 32. 
Another series of sheets preceded the above described. This other series con- 
sists of photolithographs, black, made from drawings by J. A. Flemer and E. H. 
Fowler. The method of designating them has been changed from time to time, 
leaving the whole in confusion. Sheets have been designated “Section No 10 W.,”’ 
“Section D, Sheet No.1,” and also by numbers, such numbers not agreeing with 
these nowinuse. These sheets are 15 by 18 inches, and about 15 of them haye been 
issued. 
