Picked up a 1972 Taylor barograph. This is a weather instrument with an electronic rotating drum. On the drum is taped a chart and, in combination with a "pen" (of sorts), barometric pressure is recorded. After a week, the charts are removed and replaced with a fresh one.
I picked this up surplus with the hopes of reselling, but I am having trouble with two things: 1) sourcing a *cheap* slow drying ink, and 2) possible pen woes.
I'm posting here because the rotating drum is, after all, electronic. In other words, it does not use a wind up key, but electronic mechanism and initial tests show that at least it appears to be rotating correctly and on time.
However, just for testing, I cannot seem to find a low cost slow drying ink. There is "barograph ink", but it is quite expensive for a tiny amount. I know there must be alternative slow drying inks out there with different names at less cost that might be suitable. Any suggestions would be welcome here.
Another thing I want to work on is the pen. The original is a tiny, triangular shaped stainless steel reservoir. A drop of ink is placed in the reservoir and this lasts until empty. There are alternative "pens" that are felt tipped, require no ink, and last up to two years... but again expensive. I'm wondering if I might be able to modify or use a standard felt pen from the store somehow in this application. Further suggestions appreciated.
Thank you, JJ