After comparisons with other screens in the UK , Stevenson 's original design was modified .
Thomas Stevenson 's development of his small thermometer screen with double louvered walls on all sides and no floor was reported in 1864 .
After comparisons with other screens in the UK , Thomas Stevenson 's original design was modified .
Thomas Stevenson 's development of his small thermometer screen with double louvered walls on all sides and no floor was reported in 1864 .