Dear Mr. Birchmeier The Chile Birchmeiers are indeed from Wuerenlingen ! As you correctly note the family of your ancestorsemigrated in 1883 (the exact date is November 20 according to the Wuerenlingen citizens register) and they left Europe via Bordeaux on the ship "Britannia" on November 23 (according to the Wuerenlingen town history, published in 1964). I found the following information on page 604 of Vol II of the Wuerenlingen citizens register: Paul Birchmeier, carpenter, born 27 Sept 1841, died 5 April 1911 married on May 10, 1869 Kunigunda Birchmeier (of another branch of the family!) born 9 September 1842.
Their children at time of emigration: Friederich (Frederico) born 8 September 1869 Pauline born 11 December 1870 Maria Kunigunda born 24 February 1872 Paul born 25 February 1873 Maria Verena born 8 October 1875 Berta Rosa born 11 January 1881 Anna Katharina born 26 February 1882 Adelheid born 5 August 1883
On the bottom of the page of citizens register it says "Obige Familie ist nach Chili ausgewandert" (Above family emigrated to Chile).
Please contact me directly by email for further information. Best regards from Peter W. Frey and Monika Merki Frey (whose mother was a Birchmeier).