Albuquerque morning journal. [volume] (Albuquerque, N.M.) 1903-1926, 1909-05-06
For sale by all Grocers

for distribution. This map represents
by far the most complete survey eve
made of this section of the territory
1t shows so clearly every physical fea-
turc Of the country covered that the
character of any part OF the quadr-
angie, as well as the shapes and
areas of the hills and valleys. can be
seen at a glance. The elevation OF
any particular point in the entire area
can be easily determined. This relief
of the country is graphically shown
by means Of brown contour lines. eaco
on"'of which represents d certain ele-
walton above the sea-that is. tho
traveller following the course shown
by n of these contour lines viii 60
neither up hin nor down hill. but on
a Lowell. The elevation Indicated by
every fifth line is shown by figures on
the map, ana ii Is interesting to de-
termine the heights Of different points.
by simply counting the contours up or
down from one of the marked lines.
1t is easy to understand how such
a map IS of prime value to the engi-
ner who may be laying out a railroad
or trolley route, a highway, q drain
age or irrigation system-in fact, any
piece Of engineering work. The wat
er features of the quadrangle. streams.
lakes, etc. are shown in blue. With
the same eXactness Of outline as the
land features. In addition to :he topo-
graphy, the map shows, in black. al
the works of man-roaGs. principal
bridges, towns, hoases, etc.
The topographic mapping lone by
the geological survey represents the
highest type Of geographic work, and
the maps show substantially every |
thing MS it is on the ground at The
time of survey. In making the survey
of this particular area, the topOgra-
pliers tramPed over practically every |
portion of the quadrangle. hundreds OF
being thus covered. Permanent
iron bcnchmarks, showing exact ele~ |
I%ations, were also set at various points
in the quadrangle. The location of
.hese marks is indicated accurately on
he map. and they can be used for all
.imc as the basis for any further clc-
alton surveys desired. This sort of
map making is a very different un-
lertaking from that Of constructing
IN average geographical map. which
5 generally a matter OF mere approx
nation and compilation. Everything
IN the geographical survey topogra-
sheet is exact and true to nature,
This sheet forms but one small sec
Of the great topographic atlas or
nap of the United States which thu
Geological survey is making, AMI
which will be the largest and yet most
mar in the world. Already
nineteen hundred Of these
heets have been completed. covering
yer "A third of the country.
In some parts of the country much
f the work is carried through rough
nd almost impossible areas, with
ense forests, insurmountable preci-
or deep morasses. Hundreds OF
,mporary camps are made during
ach field season, at attitudes rang {
1g from above snow line to below sea /
All this work is followed by an f
normous amount of office drafting.
nd the task is finally completed In r
vamplcs of copper-platc engraving {
nd photographic printing second TO no y
in the world.
The cost to the government of these g
%ladranglc surveys. for both field and
rrice work. ranges from $4,000 10 It
1000 each, but the maps are sold il
only the nominal cost 81 paper ana n
hitting cents a copy or SO Il hun d
ed. al
The geological survey will furnish g
charge index sheets showing -
| the topographic maps which it has e
lblished. S'