Pinnules Plunging Level By Jules Lefebvre Et Cie - Circa 1875 - Ref Sdc25cli002

Pinnule diving level by Jules Lefebvre et Cie - Height 19 cm, length 24 cm - Circa 1875 SDC25CLI002 Sold with a handcrafted solid wood stand, excellent presentation for a collection The device was used by surveyors for field operations. Like many surveying instruments, it is placed on a three-pronged oak stand or on a simple stake. Sighting is done by aligning three elements: the narrow hole of the first small brass plate or pinnule, the crossed reticle of the other pinnule parallel to the previous one and a point on a staff which is placed at a certain distance. This is an application of the phenomenon of rectilinear propagation of light. Diving spirit level with a beautiful handcrafted wooden stand Used in the 19th century, for military engineers, architects and other trades, bridges and roads ... Some adjustments to oil, unblock ... Very simple to do Bubble in good condition, fully functional Appears in good general condition and appears functional Dimensions approximately 19 x 24 cm Fast and well-protected delivery SHIPPING WORLDWIDE