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How many working days in year 1905?
Here is the detail of the calculation:
Because 1905 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 53 sundays. It remains 260 days.
Now, let's remove 12 public holidays that do not fall during a weekend and we obtain 248 working days in 1905.
 Here is the list of these 12 public holidays: 
 
 1. Berchtold's Day : Monday, 2 January, 1905 
2. Good Friday : Friday, 21 April, 1905 
3. Easter Monday : Monday, 24 April, 1905 
4. Labour Day : Monday, 1 May, 1905 
5. Ascension Day : Thursday, 1 June, 1905 
6. Whit Monday : Monday, 12 June, 1905 
7. Corpus Christi : Thursday, 22 June, 1905 
8. Plebiscite Commemoration Day : Friday, 23 June, 1905 
9. Swiss National Day : Tuesday, 1 August, 1905 
10. Assumption of Mary : Tuesday, 15 August, 1905 
11. All Saints' Day : Wednesday, 1 November, 1905 
12. Christmas Day : Monday, 25 December, 1905 
And here is the public holiday falling on a weekend:
1. New Year's Day : Sunday, 1 January, 1905