This section is from the book "Modern Buildings, Their Planning, Construction And Equipment Vol6", by G. A. T. Middleton. Also available from Amazon: Modern Buildings.
The Masons' Scaffold has been referred to on page 150, Volume I. Further attention may, however, be drawn to it (see Fig. 279), from which it will be seen that two parallel frames of standards and ledgers are erected along the line of wall. The inner frame should be constructed as close as possible to the wall. The standards in such scaffolding should be from 4 to 5 feet apart, with ledgers and braces fixed as before; but the putlogs would now rest on ledgers at each end, and not as in bricklayers' scaffolding. Special attention should be given to bracing - the inner and outer standards being connected by short braces across each bay as shown.
It is often necessary to provide a landing or platform on which the stonework or other material can be deposited (see Fig. 280). Face boards should be fixed to prevent the stone or load catching the under side of ledger and so being damaged.
It will be interesting to note the names of some of the knots in use for buildings and scaffolding purposes, illustrations of which are given in Fig. 281.
Overhand Or Thumb Knot. Prevents the opening out of end of rope, or passing through the sheaves of a block.
Figure Of Eight Knot. Prevents the' opening out of end of rope, or passing through the sheaves of a block.
The Bend Or Weaver's Knot. For joining ropes together or securing a rope through an eye splice.
Wolding Stick Hitch. Used in connection with a pole employed as lever.
Bale Sling. For hanging on to hook of lifting tackle.
Magnus Hitch, Or Rolling Hitch. For lifting material.
Two Half Hitches, Or Builder's Knot. Used for tying ledgers to standards.
Clove Hitch, Or Loop Hitch. Used where ends of ropes are not available.
Loop Knot. Used where ends of pole are not available.
Sheepshank, Or Dogshank. A method of shortening a rope without cutting it or reducing its strength.
Midshipman's Hitch. Used as shown with rounded hook.
Catspaw. An endless loop - used where great power is required.
Capstan Knot, Or Bowline. When tightened it will not slip.
Timber Hitch. For carrying scaffold poles. Take turn round pole, and finish with jamming turns.
Artificer's Knot. Or half hitch and overhand.
Topsail Halliard Bend. Used as a timber hitch.
Butt, Or Barrel Sling. When placed horizontally.
Butt, Or Barrel Sling. When placed vertically.
19. Double overhand knot.
20. Running bowline.
21 and 22. Marrying, or Splicing band tie. - Start as shown in No. 21, and when end of rope is nearly reached take the rope twice between the poles and round the turns already made, and finish with jamming turns. Then tighten with a wedge.
23, 24, and 25. Tying between standard and ledger. - Start with two half hitches as shown in No. 23. Then twist ropes together as far as possible, and then place ledger in position above the hitches, No. 24. The twisted ropes are then drawn up in the front of the ledger to the left of the standard, taken round the back of the standard, brought again to the front, and round ledger to the right of the standard, then cross in front of the standard, and round the ledger at the left of the standard, and brought up and carried round the back of the standard. Finish with jamming turns as shown in No. 25.
Portuguese Knot. Used for shear legs. Made by several turns of the rope round the poles and interlaced at ends.
Double Bend. Where a small rope is to be bent on to a larger one this is useful. The end of the rope is given an extra turn round the bight of the other, with the result of considerable increase in strength.
28. Fisherman's knot.
Lark's Head. Fastened to a running knot.
30. This is a method of raising scaffold poles to a vertical position by using the timber hitch and half hitch. If the upper end should be required to be free while the pole is being carried, the half hitch can be replaced by a cord tied round the pole and the lifting rope.