Thanks for the replies - very helpful forum!.
I started doing all the necessary calculations when I figured out that a gravity strength calculator is a thing that exists. :
The local gravity calculator states the following: This local gravity calculator determines the theoretical acceleration due to gravity at a particular location. If the actual local gravity value is not known this calculator will provide a close estimate by correcting for latitude and height above sea level.
I was wondering - unless i'm mistaken - it doesn't seem to take into account the loss of weight of an object due to the centrifugal force of the planet? I also understand that the gravitational pull of the moon and sun would have a effect albeit very small.
I was also wondering if a better experiment could be devised. Ideally multiple readings taken from different locations on the planet would offer better results than a single reading. It would be possible to prepare a simple package which would contain the following:
1 - Precision scales (or 2/3 sets ideally)
2 - 20 gram weight
3 - Log book containing time, date, location coordinates, height above sea level, anticipated weight, actual weight etc.
4 - lint free gloves or cloth.
5 - Spirit level.
6 - Set of instructions.
If I prepared the equipment - I could take a reading from england and then post the equipment to another (trusted?)member on the forum and the procedure repeated until we have a few readings. We would have to agree the method on how to calculate the anticipated loss in weight based on the globe model to make a fair comparison of the figures.
Does anyone think this is a good idea?
Q.