26. Hygrometer not be affixed to wall, etc. unless protected by wood.
(1) No. Hygrometer shall be affixed to a wall, pillar, or other surface unless protected therefrom by wood or other non-conducting material at least [12.5 mms] [Substituted by No.1, dated 24.3.1979.] in thickness and distant at least [25 mms] [Substituted by No.1, dated 24.3.1979.] from the bulb of each thermometer.(2)No hygrometer shall be fixed at a height of more than [1.78 metres] [Substituted by No.1. dated 24.3.1979.] from the floor to the top of thermometer stem or in the direct droughts form a fan, window, or ventilating opening.
