We have a rural church built in 1920 and abandoned in 1970. By last year it was near collapsing with serious damage to the roof and one wall. All windows and doors had been removed. A few of us volunteered to save it so we got the required approvals to go on site and do our thing. My task is to build the windows, doors and related jambs. The windows are the gothic arc style. All I have to work from is one photo of what they were back in 1970 and a severely weathered window jamb with sill and stool.
The crew has completed the primary structural repairs including straightening the structure and setting it on new footings. I have completed half the jambs and windows and will have the other half completed this winter.
Google was no help to me in the how to of making the gothic arc top windows. In our area no window manufacturer wants to work in wood sash these days. I did find a wood sash manufacturer on the other side of Canada who had made one as a prototype but he explained how happy he was not to get the contract. As an aside he is still using line-shaft powered machinery in his mill, which was built in 1850.
All wood is VG Douglas Fir. The jamb arc is a 5-piece glue lam and the arced muntin is an 8-piece glue lam. Making the jigs and forms was quite a hit and miss experience. It had been forty years since I had made any sash.
Here is what we started with and test fitting one of the windows.
-- Phil in British Columbia