OF SUKVEYING IN STBU MENTS. 



63 



FIG. 400. 



FIG. 402. 



15 

 16 10 



401. Circumfereilter, 5-inch., improved, with telescope, rack adjustments, centre 



quadrant, divided compass, with vernier reading to three minutes, cross levels 

 and shifting folding sights, ball and socket joint and stand, with jointed legs 

 and spare points to use at half length (fg. 402) 



402. CIKCTTMFERENTEB, 6-inch., improved, as above 



403. MINERS' SAFETY LAMPS. (See Chemicals). 



404. HEADLEY'S 

 DIAL, much 

 improved, with 

 telescope, extra 

 large compass 

 (6-inch.), with 

 brass cover, 

 spare sights, 

 raised arc divi- 

 ded to 1 minute, 

 with capstan 

 head, screw ad- 

 justment, paral- 

 lel plates, and 

 jointed legs to 

 use at whole or 

 half length(/^. 

 404) 16 10 



401* HEADLEY'S 

 DIAL, as above, 

 with ball and 

 socket joint 



without tele- 



FIG. 404. scope 13 10 



As plain, stout, practical instruments for rough work in mines, etc., these instruments can 

 hardly be excelled. 



