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This instructable will take you through the steps of making a Fitzroy Storm Glass.

Fitzroy's Storm Glass - Weather Instrument Used on Darwin's Ship the HMS Beagle
Admiral Fitzroy (1805-1865), as commander of HMS Beagle, participated in the Darwin Expedition from 1834-1836. In addition to his naval career, Fitzroy did pioneer work in the field of meteorology. The Beagle's instrumentation for the Darwin Expedition included several chronometers as well as barometers, which Fitzroy used for weather forecasting. The Darwin Expedition also was the first voyage under sailing orders that the Beaufort wind scale be used for wind observations. One type of barometer used by Fitzroy was a storm glass. Observing the liquid in the storm glass was supposed to indicate changes in the weather. If the liquid in the glass was clear, the weather would be bright and clear. If the liquid was cloudy, the weather would be cloudy as well, perhaps with precipitation. If there were small dots in the liquid, humid or foggy weather could be expected. A cloudy glass with small stars indicated thunderstorms. If the liquid contained small stars on sunny winter days, then snow was coming. If there were large flakes throughout the liquid, it would be overcast in temperate seasons or snowy in the winter. Crystals at the bottom indicated frost. Threads near the top meant it would be windy.

Step 1: Equipment

You will need a glass container that is seal-able. ( I used an old 100ml measuring tube and cork)
A piece of appropriately sized wood for the base. ( I used a piece of 70x70x40 Iroko)
Epoxy Glue to bond the glass to the base.
Lathe, Turning Tools and finishes
Printer and laminator to make info cards.
2 Beakers to mix chemicals in
Chemicals to make the storm glass contents are:
2.5 g potassium nitrate
2.5 g ammonium chloride
33 mL distilled water
40 mL ethanol
10 g camphor (natural not synthetic)
<p>am i interpreting the storm glasses in your intro picture correctly ? frosty and windy day </p>
<p>That would be my interpretation </p>
<p>also, could this work as the camphor? it is make up of 100% pure natural essential oil camphor according to the details. or does it have to be tablets like what you used?</p>
I don't think so as it is not pure camphor. The oil would affect the storm glass.
<p>thank you so much. i hope you dont mind the questions. </p><p>for this specific experiment, can i combine ammonia and hydrochloric acid to make the ammonium chloride? if so, what what are the measurements? </p>
It is possible to make ammonium chloride from ammonia and hydrochloric acid, how successful it would be for this I'm afraid I don't know. Depending on the purity of your reagents will depend on the outcome. As ammonium chloride is easily available and the reaction releases gas and is exothermic, I would suggest it is safer to just buy it. I'm afraid I can't comment on specific quantities needed, or the exact procedure, but you will probably find information on YouTube.
<p>how about the camphor? would it be necessary to use natural essential oil camphor?</p>
<p>How necessary is decanting the soloution into the storm glass? Why is this important?</p>
I made a larger volume of solution than would fit in one storm glass, so I was decanting the solution into several.
<p>I have an end of the year project for my AP chemistry class and have decided to make a storm glass for my experiment. I have a few questions about equipment and finding them. </p><p>Does the container have to be in a tube-shaped glass or can it be in a flask shape? Where can I get natural camphor? Does Walmart sell them? Are there any convenience stores that might sell natural camphor used for the storm glass?</p><p>Thanks in advance.</p>
the last ones I made, I used glass stoppered reagent bottles with epoxy on the stoppers.
<p>Thank you so much. I appreciate the help.</p>
you can use any container you like as long as you can seal it to prevent evaporation. I got my camphor on eBay, but I'm sure it must be available elsewhere. <br>Look at this on eBay http://www.ebay.co.uk/itm/331096179065<br><br>what a great school project
<p>Where can I get pure ethanol?</p>
http://pages.ebay.com/link/?nav=item.view&amp;id=252353597807&amp;alt=web
sorry only just seen this, were in the world are you? you can get it on both eBay and Amazon in the UK
Where do I find all the chemicals to make this? i want to try but I have no idea where to find all that.
all available on eBay or Amazon in the UK
<p>can I use a plastic instead glass?</p>
I have never seen them in plastic but that's not to say it wouldn't work. Plastic generally isn't as transparent as glass.
I have a question about where to place the storm glass. Inside, garage or outside? I would really like to keep it inside if possible.
I keep mine inside out of direct sunlight and extreme temperatures.
<p>Just wondering if the addition of a little glow-in-the-dark dye would affect it? Just thought it might add a little pazzaz!</p>
It sounds like a good thing to try, the only problem I can see is keeping the dye in suspension and it not settling at the bottom.
<p>I would like to make some devices, but I have many questions, like:</p><p>do you use waxy camphor or camphor oil?</p><p>will silicone used as a sealing agent bother the mix?</p><p>can it go in a poly-carbonate or plastic vessle? </p>
I disolved camphor tablets, not sure oil would work. Silicone shouldn't affect the solution. I have never seen these in anything but glass, I can't think there would be a problem with polycarbonate.<br><br>Thanks
<p>How would you go about sealing the corked end to the in a nice looking way? I'm trying to do something like this, but the liquid needs to be refilled once in a while, because the cork is not totally keeping the moisture in. Would you suggest dipping it in wax? </p>
dipping in wax, coating in epoxy glue or even thin superglue should do the job
<p>What concentration of ethanol are you using in your solution?</p>
<p>99%+ its laboratory grade</p>
Why the 'natural' camphor vs. synthetic? I didn't know synthetic was available but just higher purity grades of natural. How pure should the 'natural' camphor be?
Neither did I but my research says that synthetic camphor exists but apparently contains a chemical that means it doesn't work as well
Thanks - i would like more info about that chemical if you don't mind. I've been in the flavor and fragrance business for about 40 years and a lot of that was in the analytical area using GC, GC/Mass Spec. etc. Generally, hight purity synthetic camphor is just that, high purity. Natural camphor is from plant sources and mother nature tends to make vegetable soup rather than purity. I would like to get the benefit of your research about the chemical that causes an issue where this doesn't work as well. It would seem that when this technique was invented quite a long time ago that purity processes weren't quite as sophisticated as today's techniques. Thanks for the instruct able! I look forward to making one or more of these and sharing my experimental data with you!
This is the Link: http://chemistry.about.com/od/weirdscience/a/fitzroy.htm <br> <br>Quote of importance is &quot;Mark Ford, who has been making storm glasses for years, e-mailed me to add that man-made camphor, while very pure, does contain borneol as a by product of the manufacturing process. His experience is that the synthetic camphor doesn't work as well as natural camphor, perhaps because of the borneol&quot; <br> <br>Hope that sheds some light on the possible reason
Thanks, now I understand! it's the l-bornel impurity that is important. Appreciate the R&amp;D!
Is this &quot;advance warning&quot; or merely current conditions?
Suggestions seem to be possibly 1-3 days ahead
They've always fascinated me, and this 'able is just what I needed to make one of my own (short of the gorgeous wood base...no lathe here). Many thanks Pudtiny
I am sure that you could make a simple lathe for yourself, with a bit of effort. <br>Find an old foot pedal sewing machine stand, and you are halfway there to a tabletop lathe!
Do the chemicals last a long time and have stability so that the glass stays indicating the weather for a long time, (years)? <br> <br>Love your instructable.
i have been wanting to make one of these for a couple of years. are the chemicals readily available? do not doubt its accuracy! <br> <br>i have 8 jars of rendered bear grease as well as chicken. they sit in my window and accurately forecast weather conditions from a day to a week in advance. they even tell me a day in advance an earthquake is going to happen, and i have learned to judge the intensity. i live in texas, i have picked up earthquakes in new mexico, oklahoma, arkansas, ans missouri. how do i know? i always check the earthquake maps! <br> <br>i have a cataloge here now with the fitzroy glass. but maybe i will make a dozen. i love homemade weather stuff!
Temperature change is the sole cause of crystal growth in storm glasses. It's success of prediction is no better than random probability. You believe they work because of confirmation bias.
I'm afraid the evidence suggests its multiple factors that effect the crystal growth. I kept my first glass in a temperature controlled environment and there was still change.
weren't they in use for several years? to me, that suggests they were fairly accurate <br> <br>&quot;.Clear liquid means bright weather; dim liquid, rain. Crystals at the bottom presage frost. Large flakes mean overcast or, in winter, snowy skies. If the liquid contains small dots, humid or foggy conditions can be expected. <br> <br>As its name implies, many believed the instrument was especially sensitive to the coming of stormy weather. Thus, if small stars are seen in dim liquid, thunderstorms can be expected. Threads in the upper part foretell wind. If the substance lies to one side, expect storm or wind from the opposite direction. <br> <br>FitzRoy included a storm glass as part of the FitzRoy barometer assembly. These barometers were distributed to every British port so that it could be consulted by seamen before embarkation. Many of these stone huts housing these mercury barometers are still visible in many fishing harbours. The storm glass, glass cylinders with brass caps, can be seen clamped onto the lower left of the barometer assembly.&quot; wiki <br> <br>i want 2 o r3 regardless!!
Chemicals can be found on ebay and amazon. Homemade weather instruments are fun
I am a 'literal' type. <br>I see you made several tubes. Do you need only one or all of them for this project to work? <br>Great 'ible!
You just need one i was making multiple glasses for Christmas presents
Where did you get the chemicals. Ive bought a lot of things in my life but I wouldn't even know where to get some of those.
The dry chemicals are all available on ebay or amazon, <br>Ammonium Chloride maybe in a good hardware store for soldering iron tip cleaning and metal prep. <br>Potassium Nitrate is used both in fertiliser and for meat preservation <br> <br>
thanks for the info

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Bio: I am a senior laboratory technician in a analytical facility by day and by night I make and fix things. I prefer to work with ... More »
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