urn 



Portable Astronomical Transit Instrument. 



17. Aperture of object-glass 3 in. ; focus 39 in. ; spider-line or glass mi- 

 crometer; diagonal eye-pices magnifies from 90 to 120 dia.; Ramsden eye-piece 

 magnifies 75 dia. ; striding level reads to seconds of arc; adjustable mirror to read 

 the level from below: reserve level; pivots of hardened steel; small adjustable 

 plane reflector; two lamps and arms; reversing apparatus; two finding circles 

 each provided with double verniers ; cast-iron frame rests on three leveling screws 

 of steel, which are provided with foot-plates one of them is adjustable to set 

 instrument in the meridian ; two cases, etc. 



Price $1300, 



(.Notice of this Instrument, -with full dsscr iption, in Johnson's New Universal Cyclopaedia, under 



article " Transit") 



