Nov. 21.] THE NEW ZEALAND GAZETTE. 3339

(5) Outriggers shall be provided with a firm and substantial support, and such support and the inner end of each outrigger shall—
(a) Be secured to the building or structure with bolts or other suitable fittings :
(b) Be counterbalanced with bags of sand or other suitable material ; or
(c) Be shored ; or
(d) Be partly counterbalanced and partly shored.
Where shores are used in place of counterbalance, such shores shall be secured so as to prevent any lateral movement. The weight of counterbalance on any outrigger shall be not less than three times the load which the scaffolding is intended to carry.
(6) For the purpose of securing the fall a mild-steel or wrought-iron strap formed of a section of not less than 2 in. by ⅜ in. shall be provided at the outer end of the outrigger. Such strap shall be a close fit to the top and sides of the outrigger, and from the bottom of the outrigger make an angle until the two inside faces of the strap are 1 in. apart and then formed vertically. The vertical portions shall be parallel for not less than 2½ in., and drilled to take a ¾ in. steel bolt not less than 1 in. from the bend. The steel bolt shall be riveted over or provided with a split-pin outside the nut. The strap shall be secured to the outrigger by a bolt through the sides of the strap and the mid-section of the outrigger.
(7) The outriggers shall be of steel, and shall be of a section equivalent in transverse strength to a 7 in. by 3½ in. by 15 lb. British standard section, and shall not project more than 6 ft. 6 in. from the outside point of support. Outriggers shall be spaced not more than 10 ft. apart.
(8) The total width of the platform shall not exceed 5 ft.
(9) The staging shall be supported on steel bearers equivalent in strength to 2 in. by 2 in. by ⅜ in. British standard steel angles, and shall be formed of close-laid straight-grained Oregon pine planks or other suitable timber not less than 2 in. thick. The ends of the planks of each unit comprising four winches shall be cleated, such cleat to be of not less than 4 in. by 1½ in. timber placed near the ends of the planks and outside the steel bearers. Each plank shall be secured to the cleat with bolts not less than ⅜ in. in diameter. Each plank shall have a lap of at least 12 in. beyond the supporting bearers.
(10) Fender-boards shall be firmly secured to the outside and ends of the platform.
(11) A guard-rail of straight-grained Oregon pine or other suitable timber not less than 3 in. by 2 in. or iron pipe of 1 in. diameter shall be securely fastened at a height of 3 ft. above the platform.
(12) Where required, ties between the platform and building shall be provided and fixed.
(13) The total load on each unit including workmen and material shall not exceed 10 cwt., and no person shall use, and no owner or person in charge shall permit to be used, a suspended scaffolding any unit of which bears a greater total load than 10 cwt.
(14) Every person raising or lowering or assisting to raise or lower a suspended scaffold shall carry out the process in such a manner as to ensure that the platform remains substantially level.

BOATSWAIN’S CHAIR.

6. (1) All overhead support for a boatswain’s chair shall be of sufficient strength to sustain a load not less than three times the weight proposed to be suspended therefrom.
   (2) The fall used for suspending a boatswain’s chair shall consist of four (4) parts of manila rope, each part to be not less than 2½ in. in circumference, and to be reeved through a double and single block. The sheaves of such block shall be not less than 4 in. in diameter ; wooden blocks shall not be used unless the cheeks are strapped with metal.
   (3) The slings or strops to support a boatswain’s chair shall consist of four parts of rope, each part of which shall be not less than 1½ in. in circumference.

TRIPOD GANTRIES.

7. (1) Every tripod gantry not exceeding 100 ft. in height designed to support a steam or other crane to lift a weight of not less than 5 tons and not exceeding 10 tons shall be constructed as follows :—
   (a) The legs shall be not less than 6 ft. square on plan, and shall be constructed with 6 in. by 6 in. corner posts extending the full height of the gantry, and shall be firmly fish-plated and bolted at junctions, and firmly tied together with 6 in. by 3 in. transoms not more than 8 ft. apart, and braced on each side with 6 in. by 3 in. braces firmly bolted to the corner posts.

B