I am looking for information about the design of bridges made from wood; historical (covered bridges) and also modern bridges and eventually another large wooden beams supportet structures. I'd appreciate any web links, book titles. I need the info for my friend, retired engineer, who tried hard...
I hope that I am in right forum.
Lately I had the estimates done for my small houses (upstate NY) the central air and heating. All companies are trying to sell me the high efficiency furnace. They say, that the lower gas consumption will pay quickly for the price of the furnace. My question is...
