Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 142
on, and then covered over with concrete. 830 IIA WKINS ELECTRICITY Joints in Multiple-duct Vitrified Clay Conduit.—In lay ing multiple duct earthenware conduit, the ducts or sections arecentered by means of dowel pins inserted in the holes at eachjoint, which is then wrapped with a six inch strip… … MANDREL- Fig. 977.—Method of laying single duct vitrified clay conduit. The tiles of the several ductsare placed close together as shown in the figure, and the joints plastered and filled withcement mortar consisting of one part Portland cement and one part sand. Concrete Duct Conduits.—These are…
Electrical engineering
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-128-66.webp)
