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it was in general, but usually with a string at the back and herein lies the problem.
Mainly I am talking about photo frames so I guess they have a permanent fixture in the middle no doubt with a single hole (forgive me, I am not at home now so I can't check)
grateful for your maths tho. - not a subject I like!
Put a level piece of masking tape on the wall to mark the line. If you are using the sawtooth hangers on the back of the frame measure from the bottom of the hanger to the top of the frame. If you are using wire or string, pull it up taut in the center and measure to the top of the frame. Place you nail of hanger bracket the measured distance below the line. To keep the picture hanging straight, drill a very small hole in the center of the bottom of the rear of the frame. Insert a small nail in the hole. Clip off the head of the nail leaving about 1/16 of the nail protruding. After you have the picture hanging level press the bottom of the frame against the wall. The nail will stick into the wall and keep the frame hanging level. The hole in the wall made by the nail will be so small you won't see it if you decide to move the picture.
You might also try a laser level. Measure down from the ceiling (or closest vertical line) on one end of your wall (where your picture group will begin), then measure on the other end of your wall (where your picture group will end), and mark that spot. Use these marks to double check that your laser line isn't going slightly uphill or downhill.
You can run a strip of masking tape at the edge of the laser line, and then use that as your guide when marking your frame spots.
If you have a good eye, you can mark each end of your frame group, then mark the horizontal line without the laser level. Simply tack the tape down on one end, then pull the masking tape across to the other side, before sticking it to the wall. (This is how they pin-stripe cars and get a straight line.)
Taping paper templates to the wall where you wish to hang your frames will let you visually check the position. Then simply insert your chosen picture hanging method (nail, hook, screw, etc) through the template--then remove paper template. This way, you see your mistakes prior to putting holes in the wall.
Double check that all your hangers on the frames are in the same position. You can have the straightest wall hooks in the world, but if the individual frames have hangers in different positions, then you will still have crooked wall art.
you can buy a laser line for 40bucks or less, its small, and what youll do is set the laser at one end of the room , turn it on and it will project a red line across the wall. level it and there you go
What I would suggest doing is putting in the first nail or screw on one end of the wall where the first picture is to be hung. I like to work from left to right. Then I would suggest tying a string of some kind to whatever the picture is going to be hung on and then extending that string in a straight line to as far as you are wanting to hang the pictures on the wall and then marking where the other nails or screws are going to be placed. You or a friend could hold the end of the string while one of you looks to make sure that the string is perpendicular to the ceiling. You could even do this by yourself by taping the loose end of the string to the wall. This should solve your problem with a straight line on the wall. As far as where the hangers are located on the frames themselves and dealing with that, I do like the answer that hkstroud gave above.
You don't need any fancy equipment to hang pictures, just a straight edge of some kind such as a string would provide. Just because something is level to the Earth doesn't mean that it is going to look level to the eye.