REPORTS FROM THE SECTIONS. 163 
4 On a new method of printing Star Maps. 
q By H. C. Russert, B.A., F.R.A.S, Government Astronomer: 
= [Read before the Astronomical Section, 2 May, 1879.] 
‘ T suppose every astronomer, and many other scientific men, have 
_ ,,+0make a block for printing a star map I proceed as follows :—_ 
Having determined the size the map is to be, I obtain a plate of 
ase quite true and el. One side is then carefully rub 
With a piece of water-of-ayr stone (the same as lithographers use) 
5 =a l the tool-marks are i th 
_ Surface is obtained. 
Upon this surface two lines parallel to each side and about a 
. . le thus 
