Description and uses of Gillespie's patent inclinometer : a new levelling instrument,  with directions for its practical application and an illustration, showing the mode of producing proper and uniform drainage slopes, etc. :  manufactured and sold by Young, Peddie, & Co.
Young, Peddie, & Co. (Firm)
Edinburgh : Young, Peddie, & Co.,
1853.
Title from cover.
" The "inclinometer" is a new and important instrument for measuring, fixing and adjusting the depth and outfall of Drains, Watercourses, Conduits, Surface Slopes of  Lands, Embankments, Roads, Railway Gradients, &c., &c., and is universally applicable to determine the Plans, and aid in the execution in all Levelling or Sloping Operations known to Civil Engineering".
Levels (Surveying instruments)
Surveying
Inclinometer.