Building Materials
To retard the initial setting time of cement, the compound responsible, is

Tri-calcium aluminate
Di-calcium silicate
Gypsum
Tri-calcium silicate

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Building Materials
Priming consists of

One part of white lead, 8 parts of chalk and one part of linseed oil
One part of white lead, 8 parts of chalk and four parts of twice boiled linseed oil
None to these
8 parts of white lead, one part of chalk and four parts of twice boiled linseed oil

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Building Materials
Sapwood consists of

Innermost annular rings around the pith
Thin fibre which extends from the pith outwards and holds the annular rings together
Thin layers below the bark
Portion of timber between heartwood and cambium layer

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