Scaling tool for drawing

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Hang on Studio Wall
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I am learning something new here. I use free hand and eye to scale up or down because I  only started drawing a couple of months ago on the sketching forum and don't know anything else. The largest I paint is up to 50cm by 60cm. So if I wanted to do something large scale, I would need to look at things mentioned here so I wouldn't be holding myself back. I did buy a T-rule, a couple of months ago, which has been great, my horizons have been accurate and I use it to measure the position of were I might want an object placing in a painting. This post has been very helpful to read.
As an I-pad user, can you recommend a suitable app for the grid Alan M?  I distrust many things that can be downloaded, so recommendations are very welcome.  I have another quirk for my grid.  As. Most of the surfaces that I use are in golden ratio proportions e.g. A4 .  I divide each edge into quarters, so each section is also in golden section ratios.  I suppose I could do it in thirds on another sheet, to get the rule of thirds.  I’ve also got squares to accommodate other formats.
I have one o' they: got mine either from Jacksons', or ...... hell's bells, could have been Cass Art, Ken Bromley, Grantham's - they all stock them.  I wouldn't say it was hugely useful, I use it as a checking device rather than earlier in the process; and I admit to being far too impatient to use a grid, as well.......... I trust my eye: but can't help but feel it's just as well I'm not a tailor, since the eye is notoriously misleading - and you'd end up wearing either a tent, or a tube if your tailor foreswore the tape measure.
Hello Linda, Like you I don’t trust a lot of the internet.  I hesitate to recommend a grid app, because I am sure there are better ones out there, albeit at a price.  I did look at the Jackson’s one which looked interesting, but had some very poor reviews and there was a small charge for it.  I tried a number of other free ones but was less than impressed by them.  For what it’s worth the one I am using now is called “Grid#” .  It’s simple, a bit clunky and took a few minutes to get my head round but does the job!   Oh.. it does invite you to up upgrade for a fee but you can ignore that.

Edited
by Alan Morris

Many thanks Alan M.  I’ll give the grid a try.  
I ordered a few things from Jackson’s a few days ago, so I will wait till I need more supplies, before I buy the tool.  I will not need it till I return to my portrait class in the Spring anyway.  I don’t know how I have never seen one in real life. 
I’ve got the Jacksons art grid app on my iPad. It’s not free but for a one off payment that was quite cheap, I’ve found it useful. It’s easy to use and you can choose the size of grid squares and size of paper up to A3. 
Thank you Christine.  All suggestions are welcome.  I’ve seen artists use something of this ilk in Sky’s portrait artist of the year.  I would have thought that it is cheating, but it seams to be acceptable.
Whist nothing beats honing your observational drawing skills, sometimes it’s useful to use something to be really precise if it’s for an important piece. 
Interesting subject. I use the Acurasee proportional divider, been using this for some time now and have to say would not be without it, as I paint and draw lots of wildlife subjects to me accuracy is important, my initial freehand drawings I always check for accuracy with the divider. It is also quicker than the tedious squaring up method and you can make things much larger or smaller, but your proportions are always correct. 
I use the printer and laptop. Divide original image up into sections and print off each section in enhanced size then put it all together. Alternativly reduce the image down to the required size and, again, print off. 
Here is an App I successfully use on an Android tablet. It's free and you can choose number of rows and columns as well as the thickness and colours of the lines.  It is "Drawing Grid Maker".   Works very well.  Here is an example of one I'm working on.
That looks good Steve.  I’ll have a look.
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