Search found 25 matches
- 19 Jul 2016, 15:06
- Forum: Biology, Physics...
- Topic: Looking at the sun with telescope with filter
- Replies: 1
- Views: 3686
Re: Looking at the sun with telescope with filter
Perhaps projecting the sun would be better. More people can see it at the same time. See picture: http://www.skyandtelescope.com/astronomy-news/observing-news/how-to-look-at-the-sun/ About halfway down the picture with the text: Small telescopes are especially suited to the solar-projection method. ...
- 19 Jul 2016, 11:32
- Forum: Chemistry and Labware - General
- Topic: Plaster of Paris
- Replies: 10
- Views: 5134
Re: Plaster of Paris
Perhaps drill a few small holes in the plaster with a battery powered drill on a low torque setting, to release tension; though that may be tricky not to break the glass. Then screw a self tapping screw into the plaster then pull on it with pliers. Note: I have never tried this method.
- 19 Jul 2016, 11:24
- Forum: Chemistry and Labware - General
- Topic: Hot plate
- Replies: 4
- Views: 3200
Re: Hot plate
I am not sure if this is what you are after? You can get cable shroud that helps against heat: https://www.heatshieldproducts.com/auto ... d-sleeving
Or perhaps have the cable in a straight piece of conduit so that it can't get near to the hotplate surface.
Or perhaps have the cable in a straight piece of conduit so that it can't get near to the hotplate surface.
- 20 Aug 2009, 08:57
- Forum: Recipes and Pracs
- Topic: heat of combustion
- Replies: 4
- Views: 2257
Re: heat of combustion
Our chemistry teacher has used different fuels in spirit burners. He hasn't told me about any problems.
The wick just needs to be moist for the liquid to travel up it so you don't have to fill them completely. What is left could be poured back into the bottle.
The wick just needs to be moist for the liquid to travel up it so you don't have to fill them completely. What is left could be poured back into the bottle.
- 13 Jun 2008, 12:13
- Forum: Biology, Physics...
- Topic: Solar Power Question
- Replies: 6
- Views: 3202
Re: Solar Power Question
Solar cells have "wired" connections inside. It maybe that some of these are a bit loose. Perhaps you may have squeezed the connections. So don't worry too much about your result. Some of the commercial solar cells that have 20 year warranty "drop" cells. It just means a bit of v...
- 13 Jun 2008, 12:07
- Forum: Biology, Physics...
- Topic: Inverse Square Law for Light
- Replies: 2
- Views: 1550
Re: Inverse Square Law for Light
For this prac. you can use an axial filament light globe. So long as the filament of the light globe looks like a "point" when you stare at it, it should act like a point source of light (no reflector). I made the mistake of using a light globe that gave me a rectangular illuminated area. ...
- 13 Jun 2008, 10:37
- Forum: Chemistry and Labware - General
- Topic: CRO alternatives
- Replies: 5
- Views: 2927
Re: CRO alternatives
You can buy "adaptors" that connect with a computers USB port. That is if you are talking about measuring signals like a CRO. They aren't too expensive but they are usually limited in their voltage range to +/-20 volt but for schools that often isn't a problem. If you want to generate sign...
- 23 Aug 2007, 11:51
- Forum: Biology, Physics...
- Topic: physics
- Replies: 4
- Views: 2616
Re: physics
Hi Kerry, Usually a school would only have one of these "500 volt" power supplies as it would only be used on a demonstration practical. I agree with the posts above, the IEC 0-12V or the 0-30V power supplies should be fine for lots of physics experiments. How many did you buy? as they cos...
- 23 Aug 2007, 11:35
- Forum: Sourcing Materials & Eq Repairs
- Topic: Vaqua-pura
- Replies: 4
- Views: 2427
Re: Vaqua-pura
You can order it(resin) in the Science Supply catalogue 500g for $18 ph:1300 857 544. Or if you call CRS industrial 9899 8766 and talk to Sue, tell them you are a school. They sell it for $19 a litre. I ordered a litre and found that to be about 2 and a bit cartridges worth. I am not sure how much 5...
- 08 Aug 2007, 13:33
- Forum: Sourcing Materials & Eq Repairs
- Topic: copper wire price rise
- Replies: 5
- Views: 3017
Re: copper wire price rise
Lead prices have also risen dramatically too. So I wonder if all the lead based chemicals will also rise in price. Does any one know?
- 27 Jun 2007, 11:58
- Forum: Sourcing Materials & Eq Repairs
- Topic: White Board Makers
- Replies: 20
- Views: 7588
Re: White Board Makers
Pilot Wytebord Marker V (model:WBMA-VM). The teachers here love them. They are liquid ink. You pump the tip to recharge. You can also see how much ink is left to know to use them to the last drop. Call Pilot if you need to know which stationer has them. Something similar is Pentel Maxiflow, pump act...
- 20 Jun 2007, 11:45
- Forum: Biology, Physics...
- Topic: Van De Graaf Generator
- Replies: 12
- Views: 14552
Re: Van De Graaf Generator
I have read that you should avoid grease on the belt. So I wear gloves when replacing the belt.
- 20 Jun 2007, 11:40
- Forum: Biology, Physics...
- Topic: Projectile Launchers
- Replies: 6
- Views: 2730
Re: Projectile Launchers
Yes the one you are looking for is from Pasco, a US company.
It is quite sturdy and fires ball bearings over a distance of about 2 to 3 metres.
We have made some beautiful photos of the ball trajectory using a stroboscope and a digital camera. Let me know if you want more info on this prac.
It is quite sturdy and fires ball bearings over a distance of about 2 to 3 metres.
We have made some beautiful photos of the ball trajectory using a stroboscope and a digital camera. Let me know if you want more info on this prac.
- 20 Jun 2007, 11:36
- Forum: Sourcing Materials & Eq Repairs
- Topic: thermometer stoppers for distillation prac
- Replies: 4
- Views: 2623
Re: thermometer stoppers for distillation prac
Yes I am also looking for the little washers too. The ones I do have are made of thick felt. If I could source some thick felt (4mm thick) I may be able to cut some washers using cork borers.
- 20 Jun 2007, 11:26
- Forum: Announcements
- Topic: Upgrading of 800 science laboratories (NSW public schools on
- Replies: 104
- Views: 29804
Upgrading of 800 science laboratories (NSW public schools on
Hi all science assistants across NSW, The NSW government has set aside some money to upgrade 800 science laboratories: "$280 million for the Building Better Schools initiative which includes the upgrading of 800 science laboratories; construction of a further 18 primary school halls and 10 high...
- 24 Apr 2007, 13:07
- Forum: Biology, Physics...
- Topic: Magnets covered in Fe Filings
- Replies: 9
- Views: 4654
- 24 Apr 2007, 12:40
- Forum: Sourcing Materials & Eq Repairs
- Topic: Voltameter
- Replies: 4
- Views: 2545
- 06 Feb 2007, 12:48
- Forum: Sourcing Materials & Eq Repairs
- Topic: Overhead projectors
- Replies: 2
- Views: 1823
Overhead projector
There is too much current passing through the lamp or the legs of the lamp have a short circuit. Do have the correct voltage lamp?
I would call Gilkon (02)9914 0900
I would call Gilkon (02)9914 0900
- 17 Aug 2006, 11:12
- Forum: Chemistry and Labware - General
- Topic: Test for purity of water
- Replies: 7
- Views: 3482
I also had the same problem too. It seems to be that the first few batches of water with a new cartridge are no good. It may be due to that the beads in the cartridge need to be wet for some time before they fully activate. What I found was after a few batches the water quality improved. I got it do...
- 03 Aug 2006, 13:40
- Forum: Chemistry and Labware - General
- Topic: Chemical disposal
- Replies: 8
- Views: 4386
I have also heard that they are reviewing the chemical safety package. Part of that review could include whether to have another chemical collection. If not our school has had a quote from Plastech, Gerald ph9623 0888. You must have a lot of waste to get a quote of $3000. My school had only $114 wor...