To make sure it does not slip out of the way
Use a contrasting thread to your material, and select the longest stitch length. then sew where the tacking should be.
To reinforce pockets, you can just use a regular home sewing machine. If it's for a heavy fabric such as denim, you may want to use the heaviest needle available, or an industrial sewing machine.
"Tacking" is when you roughly sew fabric together (after pinning) with a needle and, usually, one piece of thread to hold it into place before sewing it properly with a machine. This makes it more flexible and easier to handle. It's usually practised by beginners as more experienced people tend to sew the fabric straight after pinning things into place as it's quicker, but can be a bit fiddley sometimes.
Pinning: when you use a pin to hold two or more fabrics together. The pins could be placed in the direction you want to sew to create a guideline. Tacking: hand or machine sewing with a lose stitch to hold fabric together. Tacking should be unpicked easily after use. Tacking is another version of pining, but uses threads.
Sewing peoples clothes before there was stores to buy them at.
Are you asking about a treadle machine? These were the ones used before electric sewing machines.
Prior to the invention of the sewing machine, all sewing - making and mending - would have been done by hand using hand sewing needles.
theory of sewing machine
slower, and sometimes better crafted
sewing machine:) A sewing machine uses thread to fasten fabric together. A sowing machine plants seeds.
what is the function of the head of the sewing machine
A mechanical sewing machine.