Bausch & Lomb 5-inch Tachymeter 



"Engineers" 



Telescope Erecting, 11 in. long; aperture, 1^ in.;, power, 22. 



Inverting, 10# in. long; aperture 1# in.; Bovver, X 20 or 



i. Both types transit at both ends. Cryptic focus. 

 Telescope Bubble 4 V in. long, 2mm divisions, sensibility, 25". 

 Plate Bubbles 2 in. long, 2mm divisions, sensibility, 50". 

 Needle 3js in. long, tubular, sapphire mount; weight 0.64 grms. 

 Vertical Limb 2>2-in. radius, closed or open cover guard as 



desired. 

 Horizontal Limb 2** -in. radius, 6;- 2 -in. outside diameter of 



plates. 

 Standards Aluminum bronze, bell metal journals; 6y 2 in. high, 



3j^-in. spread; 4^ in. diameter of compass ring. 

 Leveling Screws German silver, l#-in. heads; dust caps and 



guards. 



Shifting Center >-in. range. 

 Height 12J4 in. with arc; 13V in- vvith circle, 

 Finish Bakelite yellow and Kahki pyrolin. 

 Weight 13> Ibs. ; in case with accessories, 25 Ibs. 



Split leg tripod No. 75, 60-in. legs, 9# Ibs.; can be 



reduced for city surveys when requested. Ext. leg tripod No. 



75-X, 10 *{ Ibs. Heavier tripods listed below furnished if 



the preference is so stated. 



Bausch & Lomb 6-inch Tachymeter 



"Cadastral 



Telescope Erecting, 12# in. long; aperture, 1#$ in.; power, X24. 



Inverting, 12 in. long; aperture, 1/s in.: power, 23 or 



Both types transit at eye end only. Cryptic focus. 

 Telescope Bubble 4J4 in. long, 2mm di\isions, sensibility, 20", 

 Plate Bubbles 2 in. long, 2mm divisions, sensibility, 50". 

 Needle 3#i in. long, tubular, sapphire mount; weight, 0.64 grms. 

 Vertical Limb 2>-in. radius, open or closed cover guard, as 



desired. 



Horizontal Limb 3>$ in. radius, 7-in. outside diameter of plates. 

 Standards Aluminum bron/.e, bell metal journals; 6 3 4 ' in. high, 



3#-in. spread; 4J^-in. diameter of compass ring. 

 Leveling Sere ws German silver, l.U'-in. heads, dust caps and 



guards. 



Shifting Center ^'lo-in. ran 

 Height 12. '4 in. \\ithun-. 14'. in. with circle.' v 

 Finish Bakelite yellow and Kahki pyrolin. 

 Weight 16*2 Ibs.; in ca<i- with accessories, 2V;, Ihv 



Split leg tripoi! >0-in. legs, 11 '. Ibs. Kxt. leg tripod. 



\, 13 Ibs. 



127 



