My stones aren't fat, they are big boned
Recent discussions about black, surgical black and translucent arks had a few of us wondering what the Specific Gravity of our stones really is. In particular McVeyMac (Walt), has a stone that performs exceedingly well while a similar looking stone fails to deliver the same excellence, leaving us wondering if one stone might be more dense than the other. A higher specific gravity would suggest the stone is more dense. While density doesn't mean "hard", it does seem to influence the type of edge that a stone is capable of creating. All things being equal, a very hard and very dense stone should provide a better finish than a softer and/or less dense stone.
So, I let the inner scientist loose and set out to measure the Specific Gravity of a few of my stones. I will eventually copy this post to its own thread so others can document and discuss their stones SG and the quality/type of edge produced. I will move the post once I have pictures to include with the data.
**Measuring Specific Gravity accurately requires a certain amount of precision and adherence to process but it isn't hard to do. Because several of my stones are too heavy for my little (more accurate) scale I had to use a larger, less accurate, scale. I will report my SG findings to two decimal places BUT the accuracy of my scale really makes that last digit an estimate. I figure with the larger stones the limited accuracy will have less of an impact on the final calculation than it will on smaller stones, so i will double check (later) the smaller stones using a more accurate scale.
***Calculating a meaningful or descriptive SG on a stone of mixed type is not possible ...but I will probably report what i find none-the less just for kicks. My 8 year old daughter seems to understand the calculations so i figure it will be a fun experiment for her to do.
Solid Coticle chunk = 3.18
Vosgienne/French Vosges/Brown Thuringian = 2.79
Trans Ark = 2.66 (consistent with expectations)
Surgical Black Ark = 2.65 (consistent with expectations)