Sectional Elevation (scale 1:2) of Ottewell Sight Feed Lubricator

Sectional Elevation (scale 1:2) of Ottewell Sight Feed Lubricator, patent 1895, (ie 1896-83), in frame 12" x 9"

This is a modified form of feed lubricator patented by Mr. A. D. Ottewell in 1895. The apparatus consists of a large chamber containing the oil, and a smaller chamber above in which steam is regularly condensing. The steam condensed passes through an internal pipe to the bottom of the oil reservoir, displacing oil which escapes through a nozzle in the top of the reservoir into a short glass tube which is filled with water from the condensed steam; through this water the oil ascends in drops at a rate that is controlled by a valve at the side of the reservoir. The condensing chamber has a side passage controlled by a valve, through which the steam enters and also the oil escapes, the water-level in the chamber standing at the level of this outlet, so that any excess of condensed water will flow out into the steam pipe, as will also the oil that, having risen through the glass tube, is floating on the surface of this water. When all the oil has been used, and the lower reservoir is accordingly full of water, the valves are closed and the water run out through a drain cock at the bottom of the reservoir, while a fresh supply of oil is introduced through the filling plug at the top of the reservoir.