Principles of construction
72. No beam scale shall—
(a)if constructed with swan-neck ends, be of a capacity of 7 pounds or less or have a beam under 16 inches in length;
(b)be fitted with loaded weight pans;
(c)if of a capacity of less than 2 hundredweight, be fitted with wooden scale boards.
73. Beam scales which are constructed with swan-neck ends shall have flat end bearings and swivel hooks.
74.—(1) Any attachment for adjusting beam scales or balances shall be permanently affixed to the instrument and shall be so constructed that it cannot be readily tampered with.
(2) All beam scales with wooden scale boards shall be provided with an adjusting balance ball or box.
75. All beam scales shall be indelibly marked either with the inscription “Class B” or with the inscription “Class C”.