This document is a guide to making a portable device which can be used to monitor the air, in terms of PM2.5.

These tiny particles can come from a variety of sources and could be harmful. This device will indicate when the relative number of particulates in the air is high.  It could be used to monitor the air in a workshop.

These adhesives are essentially a resin bonding agent (liquid or powder) which sets as a result of chemical action with a hardener. A catalyst may be added to accelerate setting at room temperature.

Accelerated wear tests on different fabrics. The fabrics under test are fixed to the rim of the wear wheel, which is rubbed by an arm covered with sandpaper.

Setting up and using electrically-driven overlockers.