In 1841 photography pioneer Henry Talbot patented the calotype, slashing this time to minutes
In earlier times, the footman's primary responsibility was to trot alongside ... of 
photographs to his friend Sir John Herschel in the Spring of 1841, ... Talbot gave 
this negative three minutes exposure in what is ..... WHFT, Detail of books at 
Lacock Abbey, salt print from a calotype ...