----- Original Message ----- From: <[EMAIL PROTECTED]>
> Today I compared the viscosity of two samples of BD with three oils > that I have used as damping fluid in the forks of my race-bike. To > empty a 5ml pippet took: > BD1---------8sec > BD2---------9secs > 2.5wt oil---17sec > 5wt oil ----34sec Nice simple test. Harry was it a graduated pipette or a bulb pipette? If the latter what grade? At the school where I work we have tried various setups for the students to get an idea of viscosity. Pouring oil into thistle funnels with capillary tubes attached to the base worked but was extremely messy. (a lot of muck for you know who to clean up). Oil and marbles sealed in testtubes seemed to work, but there was some variation in diameters of testtubes and marbles amongst the sets. Latest concoction that I have devised is 100ml plastic bottle, short length of capillary tube silasticed into base, rubber tubing onto capillary, glass drain tube fitted to other end of rubber tubing. A laboratory clamp is tightened over the rubber tube and a measured volume of oil is added to the plastic bottle. In use the cap is removed from the bottle, the setup is supported by a retort stand, a beaker is positioned under the drain tube and the clamp released. the student times how long the oil takes to flow into the beaker. Oil is then returned to bottle. Student then repeats expt with another aparatus containing oil of different viscosity. We have struck problems when introducing temperature into the experiment because of the difficulty in obtaining monograde oils. When I get the Pug on the road it will need a supply of 30 grade gearbox oil so that will come in handy for this expt. Regards Paul Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Please do NOT send "unsubscribe" messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
