National 156, 156-S, 157 User Instruction

National Optical & Scientific Instruments Inc.
6508 Tri-County Parkway
Schertz, Texas 78154
Phone (210) 590-9010 Fax (210) 590-1104
INSTRUCTIONS FOR MODE LS
156, 156-S, 157
COMPOUND BIOLOGICAL MICROSCOPES
National Optical & Sc i ent i fic Instrument I nc.
Model 157 is illustrated below
Models 156 & 156-S Monocular Head
Base
Illuminator condenser
Iris diaphragm lever
Swing-out filter holder
Abbe condenser 1.25 N.A.
Revolving nosepiece
Objective lenses
Specimen holder
Viewing head of microscope
Interpupillary scale
Widefield 10x/18
Sliding interpupillary adjustment,
Mark on side of eyepiece tube
Head locking screw
Arm of microscope stand
Knobs controlling X and Y
Coarse focus knob
Fine focus knob
Power on/off switch and
fuse holder on back of base
Tension adjustment collar
Rack stop adjustment screw
Knurled locking screws for securing
eyepiece
Stage
Knurled diopter ring
grips located on both left and right
side of diopter scale
for indexing diopter reading
(mechanical stage)
specimen holder to stage
(behind focus knob on left side)
movement of mechanical stage
INTRODUCTION Thank you for your purchase of a National microscope. It is a well built, precision instrument carefully checked to
assure that it reaches you in good condition. It is designed for ease of operation and years of carefree use. The information in this manual probably far exceeds what you will need to know in order to operate and maintain your microscope. However, is provided to answer questions which might arise, and to help you avoid any maintenance expense that may be unnecessary.
Your new compound microscope is a high performance microscope with high quality Achromatic objective lenses that provide good resolution and optical centering. The microscope is designed with a built-in mechanical stage providing a travel range of 70mm x 32mm in the X and Y direction with graduation reading up to 0.1mm for accurate positioning of specimen. Also included is a ball bearing quadruple nosepiece, separate coarse and fine focus, with slip clutch, to protect focus mechanism, spiral mounted N.A. 1.25 Abbe condenser and built-in 5 watt fluorescent light source.
Carefully read these instructions before operating microscope. They will permit you to use your new microscope to its fullest capability. Nomenclature used to describe components and controls is identified by referring to diagram on page 2.
UNPACKING The microscope and accessories have been carefully packed to assure they reach you in the best possible
condition. Do not discard packing container or materials until all components are accounted for. Save packing container in case microscope needs transporting to another location or shipped for repairs.
156 Monocular: Stand with head, one eyepiece, one rubber eyeshield, three objectives, condenser,
specimen holder, blue filter, dust cover, 0.9mm “L” type key wrench (for eyepiece socket set screw and tension adjustment collar) and 2mm “L” type key wrench (for rack stop adjustment).
156-S Monocular: Stand with head, one eyepiece, one rubber eyeshield, four objectives, condenser,
specimen holder, blue filter, dust cover, 0.9mm “L” type key wrench (for eyepiece socket set screw and tension adjustment collar) and 2mm “L” type key wrench (for rack stop adjustment).
157 Binocular: Stand wi th head, two eyepieces, two rubber eyeshields, four objectives, condenser,
specimen holder, blue filter, dust cover, 0.9mm “L” type key wrench (for tension adjustment collar) and 2mm “L” type key wrench (for rack stop adjustment).
DESCRIPTION OF COMPONENTS
1. EYEPIECE (ocular lens): Lens closest to the eye, magnifies the primary image formed by the objective lens.
2. OBJECTIVE TURRET (nosepiece): Revolving turret which holds objective lenses, permits changes of magnification by rotating different powered objective lenses into optical path. Reverse position permits easier access to stage when positioning specimen slides.
3. OBJECTIVE LENS: Lens closest to the object being viewed, forms first magnified image of the specimen.
4. MECHANICAL STAGE: Permits precise, mechanical manipulation of the specimen slide.
5. STAGE: Platform of the microscope where the specimen slide is placed.
6. CONDENSER: A 1.25 N. A. Abbe condenser lens positioned under center of stage, condenses light rays from substage illumination and fills the back lens element of objective lens to improve image resolution.
7. IRIS DIAPHRAGM: Attached to bottom of Abbe condenser, controls aperture of light by moving control lever left or right.
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