User:Mcapdevila/Unilens

The Unilens is a very simple and handy telescope that was invented by Major Baden-Powell. The Invention is thoroughly practical, and with it a large view of distant objects may be obtained, the maximum magnification being about four diameters.

The lens has the great advantage of always being in focus and it is a useful aid to the natural sight in the examination of hanging pictures, the architectural features of building s, and similar objects. Although the appliance is not suited to all sights, three people out of every four can use the "Unilens" quite satisfactorily, and with good results

Description
It consist of a single convex lens. 21/2 inches in 'diameter, mounted in a metal rim. and may be carried In the waistcoat pocket- The mount has a small clip with a screw, enabling the lens to be attached to a walking-stick or umbrella.

The "Unilens" Is most efficient when mounted on a walking-stick and hold at arm's length, the further it is held from the eye the greater the magnification. You may vary the distance between the eye and the lens by holding the stick horizontally with one hand and flexing the arm about. With the arm fully extended, which it roughly equal to a distance of six feet between the eye and lens, the object has its maximum magnification, though at this distance there is a slight blurring.

The best way to use the "Unilens" is lo sit down and rest the hand holding the stick on the knee, when the lens Is about four feet distant from the eye, and the user is able to see objects clearly and  sharply.