Philip stood at the east end, watching Tom build a wall. He had already constructed the bases of two ____ up to the level of the third course of stones, and now he was building the wall in between. The first thing Tom did, when the labourers brought him a stone, was to take out an iron instrument shaped like the letter L and use it to check that the edges of the stone were square. Then he would ____ a layer of ____ on to the wall, furrow the mortar with the point of his ____, put the new stone on, and scrape off the surplus mortar. In placing the stone he was guided by a taut ____ which was stretched between the two buttresses. "A stone must never touch the ones above or below," Tom said. "That's what the mortar is for." "Why must they not touch?" "It causes ____." Tom stood upright to explain. "If you tread on a ____ roof, your foot will go through it, but if you put a ____ across the roof, you can walk on it without damaging the slates. The plank spreads the weight, and that's what mortar does."

"pillars text"

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