Description

Measuring Tapes:

It is made up of cotton, coated linen, or any other synthetic material. Centimeters or decimetres are marked on the tape.

They are available in length of 20, 30, or 50 meters.

Some of the commonly used tapes in surveying are:

Cloth/linen tape: Available in lengths 10, 20, 25, and 30 metre. Also available in lengths of 33, 50, 66, and 100 feet. A brass ring is provided at the terminal end of this tape. Rarely used nowadays.

Metallic tape: Available in lengths 2, 5, 10, 20, 30, and 50 meters. Except for 2 and 5–meter tapes, other tapes have a small ring fastened at the ends which is of the same width as that of the tape for protection, and are supplied in a leather or metal case with a winding device.

Steel tape: Available in lengths 1, 2, 10, 20, 30, and 50 meters. Except for 1 and 2-meter tapes, other tapes have a small brass ring fastened at the ends. These tapes are supplied in a corrosion–resistant metal case or a leather case with a winding device. It should be handled with care, as it is a delicate instrument. However, its quality and accuracy are far better than the other tapes.

Invar tape: Available in lengths of 20, 30, and 100 meters. Made up of an alloy of nickel and steel with a low thermal coefficient of expansion. Used for linear measurements that require high precision. It should be kept on reels of high diameter as they can be easily bent and damaged.