On Sunday, October 18, 2020 at 3:09:55 PM UTC-4, Jim S wrote:
10 year old thread but anybody know where to find a mechanical barograph? Thanks.

They're not accepted for badge flying according to the 2020 Sporting Code, by my reading of it (from the 2020 Edition, effective 1 Oct 2020):

1.4 BADGE and RECORD REQUIREMENTS
1.4.1 General
Electronic flight data and a DECLARATION are required except where specifically exempt.

3.3.3 Altitude evidence
a. Up to 15,000 metres, pressure data recorded by an FR shall be used.

NAC (read SSA)-approved position recorders can be used, with GPS altitude, with an altitude penalty, up to the end of the Gold Badge.

To read the Sporting Code, go to https://www.fai.org/igc-documents . Then scroll down and select 'Gliding'. Then select 'Sporting Code - Section 3 Gliding'. Then select 'Current Sporting Code for Gliding'. Then there's a drop-down list. You want the 'Sporting Code Section 3' - which has the definitions; and Annex C, which is the 'how-to'.