Search found 25 matches

by PhysicsOne
19 Jul 2016, 15:06
Forum: Biology, Physics...
Topic: Looking at the sun with telescope with filter
Replies: 1
Views: 496

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. ...
by PhysicsOne
19 Jul 2016, 11:32
Forum: Chemistry and Labware - General
Topic: Plaster of Paris
Replies: 10
Views: 1025

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.
by PhysicsOne
19 Jul 2016, 11:24
Forum: Chemistry and Labware - General
Topic: Hot plate
Replies: 4
Views: 693

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.
by PhysicsOne
20 Aug 2009, 08:57
Forum: Recipes and Pracs
Topic: heat of combustion
Replies: 4
Views: 403

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.
by PhysicsOne
13 Jun 2008, 12:13
Forum: Biology, Physics...
Topic: Solar Power Question
Replies: 6
Views: 551

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 voltage loss but they...
by PhysicsOne
13 Jun 2008, 12:07
Forum: Biology, Physics...
Topic: Inverse Square Law for Light
Replies: 2
Views: 330

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. The filame...
by PhysicsOne
13 Jun 2008, 10:37
Forum: Chemistry and Labware - General
Topic: CRO alternatives
Replies: 5
Views: 486

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 signals, eg au...
by PhysicsOne
23 Aug 2007, 11:51
Forum: Biology, Physics...
Topic: physics
Replies: 4
Views: 530

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 cost almost $...
by PhysicsOne
23 Aug 2007, 11:35
Forum: Sourcing Materials & Eq Repairs
Topic: Vaqua-pura
Replies: 4
Views: 480

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...
by PhysicsOne
08 Aug 2007, 13:33
Forum: Sourcing Materials & Eq Repairs
Topic: copper wire price rise
Replies: 5
Views: 497

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?
by PhysicsOne
27 Jun 2007, 11:58
Forum: Sourcing Materials & Eq Repairs
Topic: White Board Makers
Replies: 20
Views: 1449

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...
by PhysicsOne
20 Jun 2007, 11:45
Forum: Biology, Physics...
Topic: Van De Graaf Generator
Replies: 12
Views: 2962

Re: Van De Graaf Generator

I have read that you should avoid grease on the belt. So I wear gloves when replacing the belt.
by PhysicsOne
20 Jun 2007, 11:40
Forum: Biology, Physics...
Topic: Projectile Launchers
Replies: 6
Views: 494

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.
by PhysicsOne
20 Jun 2007, 11:36
Forum: Sourcing Materials & Eq Repairs
Topic: thermometer stoppers for distillation prac
Replies: 4
Views: 476

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.
by PhysicsOne
20 Jun 2007, 11:26
Forum: Announcements
Topic: Upgrading of 800 science laboratories (NSW public schools on
Replies: 104
Views: 6050

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 scho...