IN-BYE. — In the workings, or away from the shaft.

IN-BYE SIDE. — One place further into the workings than another, is said to be on the in-bye side of it.

INCLINE, INCLINED PLANE. — If one end of a plane is higher than the other it forms an incline or inclined plane. if coals are required to be brought down it, and the inclination is sufficient to enable the descending load of full waggons or tubs to take up the empty set without any aid but that of gravitation, the way is made into a self-acting inclined plane. If coals are required to be brought up the incline, engine power is necessary.

An underground self-acting plane should not have a less inclination than 1¼ inch to the yard, 1 inch being barely sufficient to cause motion. According to Mr. B. Thompson, 8 loaded chaldron waggons descending a plane of 5/8 of an inch per yard will bring up 8 empty ones at a good working speed. 6 loaded waggons require a fall of ¾ inch to the yard, and 4 loaded waggons require 7/8 in. to the yard. (Inventions, Improvements, and Practice.)

INSENSE. — This word means more than to explain. It means making the person to whom the explanation is given thoroughly understand such explanation.

INSPECTOR. — A man employed at the surface to attend to the cleaning and skreening of the coals. His wages are usually 3s. per day, or 18s. per week, with his house and firing free. (1849.)

An underground inspector is required to attend to the working of the coals, and to see that proper pains are taken to make them large and good. He is also required to attend to the straight driving or holing of the places, and to set on compass marks for the purpose. The back over-man, where a colliery is not overcharged with fire-damp, and his time and attention not sufficiently engaged in attending to the safety of the mine, performs the above duties during his shift. The wages of an inspector are 21s. or 22s. per week, with house and firing free. (1849.)

INSTROKE. — In many leases of coal it is stipulated that the coal demised is to be worked by means of pits to be sunk upon the property, in which case it is not unusual to allow any adjoining royalty to be worked by means of drifts, properly provided, on payment of a rent for this privilege which is called an outstroke rent, the drifts being called outstroke drifts. The coal which is so worked is worked by an instroke, or, if any portion of the royalty first named is worked by means of drifts from the adjoining royalty, this constitutes an outstroke from the adjoining royalty, but is an instroke into the royalty upon which the pits were sunk, the whole of the coal thus worked being drawn at such pits.

INTAKE. — The airway along which the fresh air is conducted into a place, district, or mine.