45, CORNHILL B.C., AND 122* REGENT STREET, W., LONDON-. 



290 



Fm. 1197. FIG. 1201. 



1190 Current Meter, for ascertaining the tidal rate or flow of streams or rivers, 



in Miles, Furlongs, and Feet ; the amount of Water delivered per hour 

 in Cubic Gallons and inches ; and the Dynamic force of the Current. This 

 instrument can also be .used. as a Log, to determine the rate of a ship's 

 speed. The scales on the'divided wheels are laid off by careful experiment 

 (fig. 1190). Price in mahogany box . . . .660 770 



1191 4-inch Pocket Inclinometer, Brass mounted, with Sights and Graduated Arc 



for determining the inclination of strata, &c., with socket for staff ; in 

 mahogany box (fig. 1191) , 3 10 



FIG. 1191. 



1192 Clinometer or Inclinometer, 12-inch, plain boxwood, with divided 



semi-circle and plumb, for ascertaining the inclination of 

 roads, drains, strata, &c., in a rough way. The divisions on the 

 arc show degrees and inches per yard ; it has also an inclination 

 scale. Price, in pull-off case 16 6 



1193 Clinometer, 12-inch boxwood, brass jointed, with divided arc and 



inclination scale, forming a pocket rule . ... 1 1 



1194 Clinometer, 6-inch, plain-jointed, without Sights or 



Compass ......... 110 



1195 Clinometer, 6-inch, with Spirit Level, Magnetic 



Compass, and Inclination Scale 1 18 220 



1196 Ditto ditto, Bar Needle Compass, and two levels . . 2 10 



1197 Ditto ditto, with best Bar Needle and Agate Centre 



Compass in the joint (fig. 1197) ..... 330 



The inclination scale placed upon these Clinometers, &c., gives the value of any angle, as follows , 

 The angle having been ascertained from the divided arc upon the instrument, refer to that degree in the 

 column marked Angle, and opposite, in another column, will be found the rise or fall in any given measured 

 distance ; for instance, say the degree shown on the divided arc is 18, opposite to this number on the 

 scale is 3, this indicating one part rise or fall in three, or one mile in three miles, one t'oot in three feet, &c. 



