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 coarse coat, leaving the face rough in order to make a good key for the next coat: when sufficiently set, fix your cartoon in its destined position with slate nails: pounce through the pricked outlines: remove the cartoon: replace the nails in the register holes: mark in with a brush in white oil paint the spaces for the different colours as shown in the cartoon, and pounced in outline on the coarse coat, placing the letters B, R, Y, etc., as the case may be, in order to show the plasterer where to lay the different colours—Black, Red, Yellow, etc.: give the wall as much water as it will drink: lay the colour coat in accordance with the lettered spaces on the coarse coat, taking care not to displace the register nails, and leaving plenty of key for the final surface coat.

In laying the colour coat, calculate how much of the colour surface it may 163