Various practices prevail at different potteries, but the appended names and sizes are generally adopted. In every case the inside measurement is taken.
SIZES. across Top. Deep.
Thimbles 2 2
Thumbs 2-1/2 2-1/2
Sixties (60's) 3 3-1/2
Fifty-fours (54's) 4 4
Forty-eights (48's) 4-1/2