Aquaculture Engineering

Types of Tapes - Cloth Tape & Metallic tape

Unit 1- Surveying

Chaining: Instruments used for chaining

Types of Tapes

Cloth Tape or Linen tape
Cloth tapes are made up of closely woven linen, 12 to 15 mm wide, varnished to resist moisture. They are light and flexible, and may be used for taking comparatively rough and subsidiary measurement such as off sets. Cloth tapes are available in length 10, 20, 25 and 30 m (30, 50, 66, 100 ft). The end of the tape is provided with small brass ring whose length is also included in the total length of the tape.

It is not used for accurate measurements because

• It is easily affected by moisture or dampness
• The length gets altered by stretching
• It is not strong
• It is likely to be twist.
  

Metallic tape
A metallic tape is made up of varnished strip of water proof linen inter-woven with small brass, copper or bronze wires and does not stretch as easily as a cloth tape. Due to this reason it is used for some accuracy of work. Metallic tapes are made in length of 2, 5, 10, 20, 25, 30 and 50 m.