...left in ridges above the copper, causing the motor to spark. Much of the sheet mica used in electrical apparatus is first made up into large sheets of mica...etc. Ground mica applied to wall papers gives them a silvery luster. When mixed with grease or oils mica forms an excellent lubricant for axles and bearings....

...sheet mica used in electrical apparatus is first made up into large sheets of mica board or micaiiite. In this form it is available for use in most of the...etc. Ground mica applied to wall papers gives them a silvery luster. When mixed with grease or oils mica forms an excellent lubricant for axles and bearings....

...with or without tissue paper, and then subjected to great pressure, with heat to dry out the shellac. Scrap mica, or mica too small to cut into sheets,...manufacture of wall papers, lubricants, fancy paints, and molded mica for electrical insulation. Ground mica applied to wall papers gives them a silvery...

...use it in any of their apparatus. A large quantity of scrap-mica — that is, mica too small to be cut into sheets and the waste from the manufacture of sheet mica — is ground and used in many ways. Among these are the manufacture of wall papers, lubricants, and...

...baking, or by heating to soften the shellac used in the manufacture of the mica board. Insulation fof commutators is generally cut from "amber" mica board....etc. Ground mica applied to wall papers gives them a silvery luster. When mixed with grease or oils mica forms an excellent lubricant for axles and bearings....

...with or without tissue paper, and then subjected to great pressure, with heat to dry out the shellac. Scrap mica, or mica too small to cut into sheets,...manufacture of wall papers, lubricants, fancy paints, and molded mica for electrical insulation. Ground mica applied to wall papers gives them a silvery...

...with or without tissue paper, and then subjected to great pressure, with heat to dry out the shellac. Scrap mica, or mica too small to cut into sheets,...greater part is ground for the manufacture of wall Eapers, lubricants, fancy paints, and molded mica for electrical insuition. Ground mica applied to...

...use it in any of their apparatus. A large quantity of scrap mica — that is, mica too small to be cut into sheets and the waste from the manufacture of sheet mica — is ground and used in many ways. Among these are the manufacture of wall papers, lubricants, and...

...use it in any of their apparatus. A large quantity of scrap-mica — that is, mica too small to be cut into sheets and the waste from the manufacture of sheet mica — is ground and used in many ways. Among these are the manufacture of wall papers, lubricants, and...