OF SUEVEYING INSTEUMENTS. 



67 



FIG. 486. 



FIG. 447. 



FIG. 485. 



FIG. 470. 



FIG. 470*. 



FIG. 457. 



MINERS' COMPASSES, 



In square mahogany boxes to 1-inch thick outside, with sights and covers, bar 

 needles, agate caps and stops. 



3-inch, square. 



110 



4-inch, square. 



130 



5-inch, square. 



150 



452. Miners' Compasses, 



453. MINERS' COMPASSES, with floating card, same sizes and prices as above. 



454. MINERS' COMPASSES, with silvered divided ring, bar needle, etc.: 



4-inch, square. ' 6-inch, square. 8-inch, square. 



1 12 6 200 2 10 



455. MINERS' COMPASSES, with silvered divided ring, etc., as above, and two levels : 



4-inch, square. 6-inch, square. 8-inch, square. 



220 2 10 2 17 6 



456. lining OP Sumying Compass, on mahogany, with cover, 7i-inch. divided metal 



dial with needle and stop, raised divided metal circle, telescope and two levels 



330 



456*. MINING OR SURVEYING COMPASS, with tangent screw adjustment to telescope 

 and triangular base, with adjusting screws and tripod stand, complete 8 10 



For tropical climates or glaring light, Nos. 456 and 456* (of foreign make), can have 

 black dials and white figures when preferred. 



For preliminary surveys as well as for general bearings from time to time, these plain 

 hardy instruments are justly held in high estimation. 



MAGNETIC POCKET COMPASSES, 



Of superior quality, the indications of which may be fully relied upon irrespective of 

 price. The most sensitive and durable being those with bar needles, with agate stones 

 or jewels in the centres. 



F 2 



