NEGRETTI & ZANBRA'S IMPROVED TRANSIT 

 INSTRUMENTS. 



FIG. 868. 



FIG. 869. 



FIG. 870. 



868 



Portable Transit Instrument for the Determination of True Time. 



Plain Mounting with Box (fig. 868) .... Price 880 



869 Ditto ditto ditto, with vertical divided Circle, with Box (fig. 869) 12 12 



870 Ditto ditto ditto, with Illuminating Apparatus, the most com- 



plete form (fig. 870) with Box 15 15 



Pull instructions for setting up and using the above Transit Instruments will 

 be found in A Treatise on the Transit Instrument, by Latimer Clark, M.I.C.E., &c., 

 price 5s. 



871 Object Glasses, best quality, for Astronomical Telescopes, 



mounted in brass cells. 



1 inch clear aperture 



10 



. 150 



. 220 

 .350 

 . 4 15 

 . 700 

 . 9 10 

 . 14 

 . 22 

 . 42 10 

 . 75 

 . 125 

 . 200 

 . 300 

 . 400 



Quotations for larger sizes may be had on application. 



