I can't help adding that as youngsters we painted designs on paper using a strong saltpetre in a continuous line with a paper toy pistol 'cap' at the end of the trail. When thoroughly dried and ignited at the start, the 'picture' appeared gradually with a small 'bang' on completion. Happy days!
Tony M. -----Original Message----- From: Douglas Bateman <douglas.bate...@btinternet.com> To: jmikes...@ntlworld.com CC: lmcda...@lmceng.com; bro...@pacific.net; sundial@uni-koeln.de; Tony Moss <tonylindi...@talktalk.net> Sent: Sat, 19 Apr 2014 11:34 Subject: Re: Design of Cards for Campbell Stokes Sunshine Recorder I think Mike may have the wrong information. I can speak from personal (teenage) experience of making very good fireworks and soaking paper in saltpetre solution for the touch paper, which will then smoulder nicely. Saltpetre is one of the essential ingredients in gunpowder. I suspect that there are other nitrogenous compounds that have fire prevention properties, but certainly not the nitrates! Doug On 19 Apr 2014, at 11:25, <jmikes...@ntlworld.com> wrote: The fireproofing is saltpetre if I remember correctly. Mike Shaw No virus found in this message. Checked by AVG - www.avg.com Version: 2014.0.4355 / Virus Database: 3882/7365 - Release Date: 04/18/14 --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
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