The square is a right angle device of various sizes. Some models include a levelling bubble making it ideal for use on uneven surfaces such as in ditches. The square can be used instead of the boundary string or boundary scope when the jack or a bowl is in the ditch and the boundary pegs are on the face of the bank. It can also be used together with the boundary string or boundary scope when objects are on the rink surface.
When using a square:
- Make sure you follow the Common Procedures for conducting a measure described earlier.
- Make sure that the rink boundary peg positioned on the bank is in a vertical position.
- With the blade of the square extending horizontally from the handle and the outer edge of the blade facing towards the jack or bowl, place the square flat on the green in the rink on which the jack or bowl was delivered, with the handle on the surface of the green and the blade overhanging the edge of the ditch.
- Keeping the back edge of the handle parallel with the edge of the ditch, slide the square across the surface of the green towards the boundary peg until the corner of the blade at the juncture of its end and outer edge comes into contact with the centre of the peg.
- Holding the square firmly in position, look vertically down the outer edge of the blade.
- If no part of the jack or bowl is obscured by the blade, then the jack or bowl is beyond the boundary of the rink so must, therefore, be declared dead. If any part of the jack or bowl is obscured by the blade, then the jack or bowl is within the boundary of the rink so must, therefore, be declared live.