Coast Survey Report for 1853. wit. 
venient.in many compvtations#Table IIT. gives the length, in 
statute and nantical miles, of a degree of the meridian for each 
5° between latitudes 2U° and 50°—Table LV. gives the length of 
a longitude degree for each degree parallel, between Latitudes 
17° and 50°, expressed in nautical and statute miles and meters 
—Tahle V. gives the lengths of the. parallel and meridian arcs 
and codrdinates for projecting large fare in the United States 
and can be used for a map embracing the area between Latitudes 
17° and 50° and extending 70° in Longitude, which limits in- 
clade considerably more than the entire United States. Table VI. 
gives the lengths of the arcs of parallels to seconds for each min- 
ute of Latitude between 24° and 50°; it also gives the meridian 
ares and codrdinates with corresponding accuracy. This table is 
available for constructing any local map projection on a large 
scale, anywhere within the latitude specified. For state or gen- 
eral maps, Table V. should be used, and for town and couutry 
maps, &c., Table VI. is required. It will be seen that these tables 
suffice for all the geographer’s needs within our national limits, 
while a little study aud practice will enable any one to use them 
correctly and rapidly. The superiority of the projection on which 
these tables are based, should induce its general use for all the 
purposes indicated. 
enue. nal 
thus clearly set forth by the Superintendent. “ The history of 
acy. The 
the observers are still connected with the work, 1S the proper 
time, on every account to publish the observations. The econ- 
omy of present publication would be very considerable. I am 
