Tag Archives: photos

Fresnel lens

The heating effect of 300 W focussed by the Fresnel lens is remarkable.Now this is HOT. A high quality Fresnel lens melts brick.
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Power Supplies

Power supplies come in all sizes

My sentimental favourite power supply was made in 1971 and was developed over the years. It appeared in the local newspapers 8 times as a backdrop to photos about two of four state wide talent quest prizes I won between 1970 and 1973.
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Green Diode Laser 16 mW

The green laser pointer has enough power to make the Crookes radiometer rotate

This green laser pointer from 2010 above is a class IIIa 532 nm diode laser rated at 5 mW and is legal in the USA.
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