Search found 384 matches

by bigmack
22 Oct 2020, 12:49
Forum: Chemistry and Labware - General
Topic: dynamo
Replies: 6
Views: 1011

Re: dynamo

Thanks Emma .
I'm guessing from the Pics that you can move the contacts ,IE you can slacken the Green and Red knobs and slid the contacts along the rails to set it up for either AC or DC generation .
You might want to check the alignment or try the other position .
Hope this helps
commutator.jpg
by bigmack
22 Oct 2020, 09:30
Forum: Safety with Chemicals
Topic: RiskAssess chemical codes
Replies: 35
Views: 3017

Re: RiskAssess chemical codes

J , what's Shaun asked you to follow in regards to Chem ratings ? RA or CSIS. ?
by bigmack
21 Oct 2020, 13:45
Forum: Safety with Chemicals
Topic: RiskAssess chemical codes
Replies: 35
Views: 3017

Re: RiskAssess chemical codes

On a brighter note, the labels are so good. There is now a new feature where you can print multiple labels for different chemicals onto the one page - great idea. LOL funny you mention that Merilyn .It only happened last week . The day after I first used it . Here I am scratching my head wondering ...
by bigmack
21 Oct 2020, 12:33
Forum: Safety with Chemicals
Topic: RiskAssess chemical codes
Replies: 35
Views: 3017

Re: RiskAssess chemical codes

Waiting for HT to see which way I am meant to proceed when it comes to labeling . Seeing as we are hoping to have all senior pracs done according to Riskassess , I am now in a quandary . Well ,as we are DET school, HT has decided that we go with CSIS recommendations regarding DETRA colour dots .She...
by bigmack
21 Oct 2020, 10:41
Forum: Chemistry and Labware - General
Topic: dynamo
Replies: 6
Views: 1011

Re: dynamo

It's unlikely the Magnets have lost enough strength for it not to work to some capacity. it is possible that the coil has gone open curcuit . You should be able to test the coil with a multimeter . It will probably read around 1-2 Ohms . Is it easy to turn the handle ? If there is a short curcuit on...
by bigmack
19 Oct 2020, 11:50
Forum: Safety with Chemicals
Topic: RiskAssess chemical codes
Replies: 35
Views: 3017

Re: RiskAssess chemical codes

Merilyn1 wrote: 19 Oct 2020, 11:45 Something to keep in mind, if seniors are needing to use a concentrate, I will decant into a smaller bottle to reduce the risk rather than giving them the 2.5L bottle.
That's definitely something I do too Merilyn
by bigmack
19 Oct 2020, 11:32
Forum: Safety with Chemicals
Topic: RiskAssess chemical codes
Replies: 35
Views: 3017

Re: RiskAssess chemical codes

Hmm , just when I thought Riskassess was making more and more chemicals harder to use , it appears that acids are now not as dangerous as they used to be . CSIS has 10M HCl as teacher only , now according to Riskassess , 11-12 can use it . CSIS has 10-18M H2SO4 as teacher only , now according to Ris...
by bigmack
13 Oct 2020, 14:42
Forum: Safety with Chemicals
Topic: RiskAssess chemical codes
Replies: 35
Views: 3017

Re: RiskAssess chemical codes

play around with it I have been . it's interesting . Not so sure I like the scheduling . LOL , having always had a day book with everything clearly viewable to recently using Sentral Resource booking , This will get a bit of getting used to . The labelling function is excellent. Apart from the DETR...
by bigmack
13 Oct 2020, 10:42
Forum: Safety with Chemicals
Topic: RiskAssess chemical codes
Replies: 35
Views: 3017

Re: RiskAssess chemical codes

Risk assess is over the top, so we were told, its really for very very large amounts. Not the amounts used in schools, That's what I thought was the case for Chemwatch , but I thought Risk Assess was designed with School Pracs in mind ....surely small amounts are factored into that . Oh well , look...
by bigmack
13 Oct 2020, 09:48
Forum: Safety with Chemicals
Topic: RiskAssess chemical codes
Replies: 35
Views: 3017

Re: RiskAssess chemical codes

We just signed up to Risk assess.I got assess to it yesterday , I'm the first :crazy: You Beauty I thought as I went to print some labels \:D/ Chem teacher doing a senior Prac from the new Nelson "Chemistry in Focus" Went to print out labels for 0.05M Potassium Dichromate and 0.05M Potassium Chromat...
by bigmack
13 Oct 2020, 08:54
Forum: Chemistry and Labware - General
Topic: Spectrum discharge tubes
Replies: 23
Views: 2785

Re: Spectrum discharge tubes

I am not sure what a spectrum discharge tube is. these are Beautiful :D Agree with earlier post that Serrata holder that they come with was utter crap , fortunately we have an oldy but a goody still on the shelf .Have to swap them one at a time , but far more stable . Neon tube.jpg Argon.jpg Mercur...
by bigmack
25 Sep 2020, 12:58
Forum: Chemistry and Labware - General
Topic: Spectrum discharge tubes
Replies: 23
Views: 2785

Re: Spectrum discharge tubes

We're having a big clean up of equipment due to losing our store room. The Crooke's Tube Cross Vacuum set we have is very old and does not work. Does anyone know how we can dispose of it? If they are just Vacuum tubes then you can just wrap them in newspaper and dispose of them as you would an old ...
by bigmack
23 Sep 2020, 10:32
Forum: Announcements
Topic: NEW GHS
Replies: 5
Views: 631

Re: NEW GHS

Doesn't seem to be that much that will impact us that I can see. Adoption of GHS 7 From 1 January 2021, Australia will begin a two-year transition from GHS 3 to GHS 7. The transition period will finish on 30 December 2022. During the transition, manufacturers and importers may use either GHS 3 or GH...
by bigmack
15 Sep 2020, 14:40
Forum: Sourcing Materials & Eq Repairs
Topic: Modern Teaching Aids
Replies: 2
Views: 583

Re: Modern Teaching Aids

I had trouble about a week ago accessing their site . tried all morning , then suddenly it worked . Maybe they are having a few outages for some reason.
by bigmack
10 Sep 2020, 14:36
Forum: Sourcing Materials & Eq Repairs
Topic: Rock and mineral specimens
Replies: 7
Views: 449

Re: Rock and mineral specimens

Shell1 wrote: 10 Sep 2020, 12:45 Hi
We went to a landscape supplier in our area and they were happy to supply us with some granite, limestone, basalt, scoria and sandstone samples.
Brilliant Shell .It's usually these basic ones that seem to get removed and not put back .