45, COBNHILL, E.G., AND 122, REGENT STREET, W., LONDON. 



305 



FIG. 1266. 



1266* Pentagraph or Pantograph, in Brass, of the best construction, for ^ 



reducing or enlarging plans to any proportion : s . a. 



18-inches from 660 



24-inches 7 10 



30-inches, Ordnance size and Pattern with improved Leg 



and Wheel 9 10 



36-inches 10 10 



42-inches 11 11 



48-inches (fig. 1266) 13 10 



1277 Pentagraph, Ebony ........ from 550 



1278 Ditto, common White Wood . . . . . 10s 6d. 1 5 



FIG. 1280. 



FIG. 1283 



1279 



Opisometer or Map Meter, for measuring Curved lines on Plans or 

 Charts, &c 036 



1280 Ditto ditto Improved, (fig. 1280) . . . . 4s. 6d. 5 6 



1281 Chartometer for measuring and registering distances on Maps. The 

 Chartometer is about the size of a watch, with a small wheel partly projecting from 

 the lower end of the case. To measure any line, the instrument is held upright, 

 and the little rolling wheel is run along the line to be measured ; as the wheel 

 advances an index hand registers on a dial the distance passed over in miles, 

 yards, &c., according to the scale of the map. It can be used for maps of different 

 Scales by a simple substitution of one dial plate for another, a variety of those 

 adapted to the ordnance measurements being contained in the case of the 

 instrument. 



1282 Chartometer with Set of Dials, in neat Leather Case . ..110 

 Ditto ditto German Silver Plated, complete in Case (fig. 1283) 1 12 

 Ditto ditto Gold plated best finish, complete in Case . .220 

 Wealemefna, a Pocket Instrument for measuring lines or distances 



on a map, Nickel Plated, 7s. 6d., [10s. 6d. ; Silver, 10s. 6d., and 

 12s. 6d. ; Gold ditto, 30s. and 50s. 



For further particulars of Drawing Instruments, Rules, Scales, &c., see Section 

 Mathematical Drawing Instruments. 



1283 



1284 

 1285 



