Go up in the attic and wherever you see daylight through the roof push
through the hole a wooden peg to mark the spot. Then, when you have
finished and are ready to climb on the roof, take off your shoes, put on
a pair of woollen socks, and there will be little danger of your slipping.
New india rubber shoes with corrugated soles are also good to wear when
climbing on the roof.
In Fig. 295½ you will see two of the pegs sticking through the roof
marking the holes, and below is a larger view of one of these pegs
connected with the upper ones by dotted lines.