Patrick Powers reports: >I sent them a message and got the following reply:
>..... Price in UK is £747 and cards are £56 / 200....... ------------------------ >A tad too expensive for me though.... Patrick I suspect more than a tad too expensive for most of us. Besides, where's the fun in buying ready made, when one can build it for oneself? A couple of thoughts: Scientific Supply catalogs carry 'boiling flasks' of various sizes, e.g. 250 to 500 ml nominal capacities, which might be suitable. They have fairly narrow, longish necks that could be accomodated in their polar mounting. Globular Christmas tree ornaments are another, cheaper, possibility, and there are now plastic ones that might be less susceptible to accidental breakage. There are some clear ones, otherwize they would require dissolving out the internal metallizing or coloring. As for potential freezing problems, one might fill with 'white' mineral oil. (From drug stores or in British Isles, 'chemists.') If water is used, it might pay to pre-boil it to outgas it, and too, perhaps add some alum to inhibit growth of micro-organisms. Some of the heavier alcohols if added to the water could also retard growth of micro-flora, and as well act as antifreeze. Bill Maddux
