We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
Bausch & Lomb Opti cal Company Hand-feed Arc Lamp with Magnetic Coils This lamp is of the same type of construction as the one described before, but it has the extension feeding and centering rods necessary for use in the large lamp house. The carbon holders are of the yoke type, giving better con- tact for the high amperages. This type of carbon holder is supplied on all arc lamps with the Combined, Universal and Convertible Balopti- cons. A feature of this lamp as illustrated is the magnetic coil which aids greatly in steadying the arc and preventing the “magnetic blow.” This coil is supplied regularly on all lamps for the Convertible Balopticon. A rheostat must always be used with this lamp to regulate the current. Note—The magnetic coil can be supplied on any arc lamp which is to be fitted in one of the large lamp houses at an additional cost of $5.00. Combined Automatic and Hand-feed Arc Lamp An arc lamp with auto- matic feed is a great conven- ience when projecting with the microscope or other acces- sories which require very ac- curate arc adjustment. The carbon feed of this lamp is entirely magnetic and operates on the full line voltage so that the feed remains absolutely constant. This is accomplished by a supplementary wire running from the intake side of the rheostat to the center binding post on the lamp. By means of an adjusting screw on the side of the lamp the separation and consequently the fre- quency of feeding of the carbons is adjusted to suit the exact voltage on which the lamp is operated. Be sure to state voltage when ordering, as the magnet must be wound accordingly. 103