296 



ITEGRETTI AND ZAMBRA, HOLBORN YIADUCT, E.C., 



FIG. 1180. FIG. 1184. 



Should it be that the large Aneroid cannot be carried, Negretti and Zambra 

 can with confidence advise the use of their Watch-sized Aneroids with altitude 

 scales. The exact size of these instruments is shown at page 19. A large number 

 of such small Aneroids having been made by Messrs. N". and Z., and reports 

 received of (their wonderfully 'accurate performance in all parts of the world, 

 warrant N. and Z. in giving the strongest recommendation to them. At page 3 

 and 26 will be found instructions for measuring heights by the Aneroid, and 

 comparative tables of the French and English scales. 



A copy of Professor Airy's Altitude Tables supplied with each instrument. 

 1180 Negretti and Zambia's full range Altitude and Surveying Aneroid 

 Barometer (Orometer), Compensated for temperature, the Scale 

 divided to Inches and Hundredths or Millimetres, with Altitude 

 Scale to 20,000 feet, or about 15 inches of the barometer scale 

 (fig. 1180) in hinged leather case ....... 880 



Solid leather case with Sling strap for Ditto ..... 12 6 



1181 Pocket Aneroid Barometer, with Altitude Scales to 5,000 feet, 



moderate elevations ; see ante, page 29 (fig. 24) . . . .550 



1182 Watch-sized Pocket Aneroid Barometers, Compensated with 



Altitude scale to 10,000 feet; see ante, page 24 (fig. 26) . .550 

 Ditto ditto, to 20,000 feet ........ 660 



Ditto ditto, to ditto in Stout Silver case . . .770 



Aneroid Barometers with adjusting altitude scales 10s. each extra. 



1183 Anemometer, Pocket, Biram's, and Lown's, for registering the 



velocity of currents of air in mines,- air shafts, drains, &c., &c. 

 For full description and instructions for use, see pages 100 to 103. 



4-inch size, 2 10s. ; 2^-inch . . . .220440 



1184 Surveyor's Pocket Compass, with Bar Needle or Singer's Card 



Dial, in Silver Watch Case (fig. 1184) .... 2 10s. 330 

 See also Section Pocket Compasses. 



