copyright reserved 
20 FAUTH & CO., WASHINGTON, D. C. 
PORTABLE INSTRUMENTS. 
All the following instruments are packed complete in "boxes and provided 
with the following accessories: Shade , screw-drivers , adjusting-pins , plumb- 
bob , reading-glass , and dust-brush. 
No. 38. 
COMBINED TRANSIT AND ZENITH INSTRUMENT, 
as devised by Prof. G. Davidson, U. S. C. S. 
