314 



NEGRETTI AND ZAMBRA, HOLBOftN VIADUCT, E.G., 



FIG. 1330. FIG. 1332. FIG. 1331. 



1330 Sun Dials, with Circular Brass slab and style (fig. 1330) : 



Diameter . . 6-in. 8-in. 10-in. 12-in. 14-in. 



Price . . 42s. 52s. 63s. 100s. 120s. 



1331 Sun Dials on Slate, the style of Brass, 12 inclies Square 



(fig. 1331) 330 



1332 Sun Dial, with burning lens so arranged that the Sun's rays are thrown on 



the priming of a small loaded Cannon, and cause it to be fired at noon 



precisely. The mounting of the lens has a scale corresponding to the 



sun's decimation for every week in the year (fig. 1332) 3 12 6 4 10 



These dials are constructed for the latitude of London. If required for other 



localities they must be made specially to order, and will be slightly increased in 



cost. 



POCKET MARINERS' COMPASSES. 



FIG. 1334. 



FIG. 1335. 



1333 



1334 



1335 



1336 



d. 



6 



FIG. 1340*. 



Pocket Compasses, Plain Needle, in square mahogany 



cases, with stops .... 3s. 6d. 4s. 6d. 

 Ditto ditto, mounted with best Bar Needles and Agate 



centres (fig. 1334) ... 6s. 6d. 7s. 6d. 10 6 12 6 

 Ditto ditto, mounted with Floating Card and 



Agate centres (fig. 1335) . . 6s. 6d. 7s. 6d. 

 Small Pocket Compasses, Round metal cases . 2s. 



10 

 2 



12 

 3 



