Then count, in the same direction, the number of spaces from the zero on the vernier scale to a line that coincides with a line on the main scale multiply this number by 5 and the product will be the number of minutes to be added to the whole number of degrees.įor example: Zero on the vernier scale has moved 28 whole degrees to the right of the 0 on the main scale and the 3th line on the vernier scale coincides with a line upon the main scale as indicated. Read off directly from the main scale the number of whole degrees between 0 on this scale and the 0 of the vernier scale. Thus, the difference between the space occupied by two degrees on a main scale and the space of the vernier scale is equal to one twenty fourth of two degrees or one twelfth of one degree (or five minutes). Twenty four spaces on the vernier scale equal in extreme length twenty three double degrees. Each space on the vernier scale is 5 minutes less than two spaces on the main scale. The bevel protractor vernier scale indicates every five minutes or 1/20 of a degree. Reading the bevel protractor Vernier scale: Picture below illustrates a variety of uses of the bevel protractor. The readings can be taken either to the right or to the left, according to the direction in which the zero on the main scale is moved. Since the spaces, both on the main scale and the vernier scale, are numbered both to the right and to the left from zero, any angle can be measured. This is because, the dial is graduated from opposite zero marks to 90 degrees each way. But remember this: To obtain the measurement of the angle between the beam and the blade of over 90 degrees subtract the number of degrees as indicated on the dial from 180 degrees. When the edges of the beam and blade are parallel, a small line on the swivel plate coincides with the zero line on the graduated dial, and when any measurement of an angle between the beam and the blade of 90 degrees or under is desired, the reading may be obtained direct from the position of the line on the swivel plate with regard to the graduation numbers on the dial. The bevel protractor consists of a beam, graduated dial and blade which is connected to swivel plate (with Vernier scale) by thumb nut and clamp. For calculation a degree is divided into 60 parts called minutes and a minute is sub-divided into 60 parts called seconds. Light-weight and portable, these are great tools to qualify parts on the shop floor.A circle can be divided into 360 equal angles. a010710ProductPhoto01FileName: 490-12-4Re52511cUSp1 a010750UsePlaceholderPhoto: N a010770ApplicationPhoto01FileN: 111204_Bevel_Protractors a010110SeriesTitle: Protractors & Angle Measurements a010120ProductTitle: Bevel Protractors a010170Brand: Starrett a0101201Description01: Steel protractors are another tool that can empower an operator to qualify angular measurement. a0106201Description01: Bevel protractors capture angular measurements with an adjustable 360 degree protractor head. itemid: 1121676 -listprice: 0 -promoprice: -1 -uom: Ea -webprice: -1 -webstatus: UNPUBLISHED a0105101Title: Bevel Protractors a0105201Description01: Bevel protractors capture angular measurements with an adjustable 360 degree protractor head.
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