Comprising a cylinder 200 x 25mm diameter one half of which is wood, the other metal. If paper is wrapped tightly round the cylinder and the rod is held above the flame, the portion in contact with the wood will be quickly scorched while the portion in contact with the metal will remain uncharred.
Member Since 21 Years
Nature of Business Manufacturer
For Buyer 
For Seller 
Help 
Mahesh Nagar, Ambala, Haryana