![]() ![]() It holds its withdrawn length, and when the ‘finger release device’ is pressed, the tape automatically rewinds into the case. The winding device is of substantial construction and is such that when the tape is withdrawn by hand to any point up to the limit of its measuring capacity. These surveying tapes are lighter and delicate and get broken easily. The ends 20, 30, and 50 meter tapes are marked with the words ‘meter’. The meter division, in addition, bears the designation to every centimeter in the first decimeter is marked. The tapes are marked on one side only, with a line at every five millimeter, centimeter, decimeter, and meter, the first decimeter having the millimeters also marked on the tape. The most common lengths being 20, 30 and 50 m. The denominations of these tape measures are 1, 2, 10, 20, 30 and 50 meters. The ring or other device is fastened to the tape by a metal strip of the same width as the metric woven tape. The outer end of the tape is provided with a ring or other device for facilitating withdrawal. They are used for accurate works and are made of Steel or of stainless steel. Watch the Video Below to Learn How to Read a Tape Measure. The purchaser can also get the year of manufacture marked on the ease. ![]() On the un-graduated side and also on the ease of each tape when provided, the name of the manufacturer or his registered trademark and the denomination is legibly marked in English. It shall fold against the reel and should have a crank length of not less than 25 mm. The handle for the winding device should be suitable for Winding the tape on the reel. The 10, 20, 30, and 50 meter tapes are supplied in a case made of leather or corrosion-resisting metal, fitted with a winding device. The permissible error in the length of the tape, when supported on a horizontal surface under a tension of one kilogram shall not exceed the following limits according to IS: 1269-1958. Read More: Theodolite Parts and Functions. The tapes of 2 and 5 meters should also have this arrangement. Over which a strip of brass or any other suitable material should be rigidly fixed for protection and for receiving the inspector’s stamp. The outer end of the tapes of these denominations must be reinforced over a length of not less than 10 cm by a strip of cotton fabric or suitable plastic material. In case of tapes of denominations 10, 20, 30 and 50 meters, a metal ring is attached to the outer end of size tape. The coating must be non-cracking and water resistant. The tape should be coated with a suitable primer of synthetic material over which one or more coats of a flexible and high quality enamel should be given. The yarn is spun from good quality cotton or linen, and the wire is of phosphor bronze, copper or stainless steel and is 0.16 mm (or 38 SWG) in diameter. The tapes are manufactured from yarn and metal wire. The decimeters are marked in black and meters in red figures. At every centimeter a black line 8 to 10 mm in height is drawn, and every five centimeters, are marked with an arrow in black.Įvery decimeter and meter is marked to the full width (i.e. The length of the tape includes the metal finger ring when provided. The metric woven metallic tapes are manufactured in lengths of 2, 5, 10, 20, 30 and 50 meters. They are meant chiefly for taking offsets and subsidiary measurements. They are better than the linen tapes, but are not suited for precise works. It is not very commonly used in Surveying and Levelling. These are not durable, and care should be taken in use as figures become illegible very soon. Its exposure to dampness causes shrinking. They stretch when the pull is exercised and may be elongated permanently. These should not be used for accurate measurements as they are subjected to variation in length. At the end of the tape is provided a brass ring whose length is included in the first hinge. It is generally available in lengths of 10, 20, 30 and 50 meters. It consists of a varnished strip of woven linen 12 to 16 mm wide and it is attached to a spindle in a leather case into which it is wound. Surveying tapes are made of various materials and therefore can be divided into different types as follows. But for comparatively short lengths to be measured, a tape of 30 meter long and 6 mm wide will be probably found as a more convenient size. Measuring Tapes are now available in different lengths and widths. You’ll know different types of Measuring Tapes used in Survey here. The availability of long tapes has considerably increased the accuracy in surveying without involving any undue waste of labor or of time. Types of Measuring Tape Used in Survey. ![]()
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