45, CORNHILL, E.G., AND 122, REGENT STREET, W., LONDON. 513 



3135 Dip Circle, or Inclinometer, Kew 



Pattern, recently improved, with 



Lloyd's total force Apparatus, 



including verification (fig. 3135) 



Price 40 



N.B. Price quoted for Dip Circle on 

 page 131 is an error, should be 40 . 



FIG. 3135. 



FIG. 3136. 



3136 Unifilar Magnetometer, Improved. Kew arrangement (fig. 3136), for accur- 

 ately ascertaining the horizontal component of the earth's magnetic force 

 and also the declination, including verification . . . 70 



2L 



