Earlier in the year the illustrious GregQ offered me his Talyvel level that he bought off ebay.. I was not in a position to buy it back then, but have acquired it off him now...
The unit is a Talyvel 2.. It uses obsolete mercury batteries of which it came with none as expected.. Mercury as apparently that battery type kept the voltage consistent when discharging, until nearly flat..
The unit has three ranges of scale to select from via a switch. At the finest resolution each graduation which is about 3mm wide represents 1 arc second or an angle of 0.005mm in one metre, you could fairly easily split the graduation by fifths via eyesight.. Which gets you down to 0.2 arc seconds (0.001mm/m) or being able to see when Phil sneezes in Thomastown.
I contacted Taylor Hobson this evening about a manual and nearly immediately got a reply with a pdf -->> http://ift.tt/1u4f5MU
It gives me all the info I need, battery voltages and everything.. I was testing it with a 9V battery which is not really enough voltage.. In any case I was able to determine the instrument works.. To the point that at the finest setting, sitting on the surface plate, just walking from one side of the plate to the other moved the needle one arc second... This is on a concrete floor..
The unit is a Talyvel 2.. It uses obsolete mercury batteries of which it came with none as expected.. Mercury as apparently that battery type kept the voltage consistent when discharging, until nearly flat..
The unit has three ranges of scale to select from via a switch. At the finest resolution each graduation which is about 3mm wide represents 1 arc second or an angle of 0.005mm in one metre, you could fairly easily split the graduation by fifths via eyesight.. Which gets you down to 0.2 arc seconds (0.001mm/m) or being able to see when Phil sneezes in Thomastown.
I contacted Taylor Hobson this evening about a manual and nearly immediately got a reply with a pdf -->> http://ift.tt/1u4f5MU
It gives me all the info I need, battery voltages and everything.. I was testing it with a 9V battery which is not really enough voltage.. In any case I was able to determine the instrument works.. To the point that at the finest setting, sitting on the surface plate, just walking from one side of the plate to the other moved the needle one arc second... This is on a concrete floor..
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