I have alot of tattoos, and I love art, I'm a decent artist, I'm just looking for a good quality setup for the best price I can get it for. how much am I looking at dropping for something like that? and what are the things I'll need besides the gun(s), power supply, ink?

I am working on a school (undergrad science level) project.

I would like to be able to send a signal in a very tightly controlled area. Ideally I would like to be able to concentrate the signal very precisely at my target, with no reception outside the transmission cone. I wonder how tightly can the signal drop be controlled.

I would like to use a frequency similar to Bluetooth or in that range.... I wonder if anyone can point me in the right direction for some information about the antenna design and --most importantly-- to the formula that would help me determine how fast the signall drops off outside the transmission cone.

My application requries relatively short (20-30 ft MAX) transmission distance.

Can someone suggest a book or article (physical or on the web) that gives the formula for the drop off of the signal outside the cone? Thanks

I am painting a staircase white. I want to add some stencilled designed to it and then apply a clear gloss varnish on top, to protect the designs below and add a gloss sheen to the surface.

I think polyurethane would work well but I want to use a natural product rather than a synthetic one. I looked at tung oil but was told that oils are only for wood whereas polyurethane can bind to anything - is this true?

Would waxes work? I know that gloss finishes are possible without synthetics because they were produced hundreds of years before synthetics were invented (e.g. french-polished floors in the Renaissance etc).

I was in a park and a car full of younguns drove up and started gving each other tattoos with a needle. They even offered to give me one, but I declined. Now I'm curious about the exact technique.