Black morning frost, bright clear day with quite a lot of sunshine; in sheltered places it was just possible to feel a little warmth in the sun. Did shopping locally including going to the butchers and the bakers. Thence to Wimbledon to buy a few more things including three sheets of picture text cards at Jenkins'. Took accumulator in afternoon. Fitted up new "Aerialite" aerial for use on radio-gram. I ran the wire up the well of the staircase through the trapdoor and into the loft. A very dirty job in the loft. It made an efficient aerial with a lot more volume without the need for so much reaction.