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A display of items drawn from the Scientific Instrument Collection of the Macleay Museum Accessories The compound microscope – what is normally thought of as a microscope – having an eyepiece and an objective separated by a tube and used for examining small objects was invented about A number of investigators made significant discoveries with compound microscopes in the late 17th century.
It was not until the early decades of the 19th century that various technical problems were significantly diminished that the microscope became a valuable instrument of scientific research. The problems were especially those of optics. Although achromatic lenses had been developed for telescopes in the mid 18th century, the small lenses used in microscopes presented difficulties of manufacture.
Leeuwenhoek Microscope – Designed around by a Dutchman, Antony van Leeuwenhoek, the microscope was a simple single lens device completely handmade including the screws and rivets with greater clarity and magnification than compound microscopes of its time.
Origins When I was a young university student my late father generously gave me a superb second-hand Zeiss Standard GFL microscope from the early ‘s with phase-contrast and darkfield. That was probably one of the main factors leading to my love for and, later, professional interest in microscopy and its application to the study of what I consider to be the microscopic biological objects par excellence – the unicellular eukaryotes protists or, in layman’s terms, the “plants” and “animals” composed of a single cell.
Over the years I have set up a personal working collection of mm tube length Carl Zeiss microscopes, which I use daily for my research and related activities. To me it looked like an extremely unusual museum piece, and a very ugly and cumbersome one too. It was about the size of a small electron microscope. I have never seen one like it again and have been unable to find pictures or further information, anywhere. Apparently, in his lifetime nobody was allowed to use it apart from Deflandre himself.
Because computers are not necessarily as manually dexterous entities as humans I think they are not as good as humans at designing and manufacturing optical components of any sort.
Improved resolution of thermal history reconstruction at low temperatures Geotrack International, in association with CSIRO Division of Petroleum Resources, Sydney, is pleased to announce this new addition to our range of thermal history reconstruction THR services. Reliable reconstruction of thermal histories in sedimentary basins is a key aspect of reducing exploration risk, e. Particularly when integrated with information from AFTA and other thermal indicators e.
Technical details Instrumentation The CSIRO He extraction and analysis facility comprises an all-metal He extraction and gas-handling line connected to a dedicated on-line Balzers Prisma quadrupole mass spectrometer.
I buy antique brass microscopes and all kinds of early microscope accessories including: lenses, parts, microscope oil lamps, prepared slides, slide preparation equipment, and slide cabinets. Also needed for my collection are old microscope related books, trade catalogs, and artwork depicting microscopes and other kinds of antique scientific instruments.
B Slides by John James J. Hunter, probably from the mid s. Some images courtesy of J. McCormick or adapted from an internet auction site, for nonprofit, educational purposes. The firm retailed a substantial amount of equipment made by other manufacturers, although they do appear to have manufactured their own camera lenses, so it is not clear whether or not they actually made any part of this lens.
Adapted from an internet auction site for nonprofit, educational purposes.
Through mounting evidence, however, the shift appears not only to have failed in accelerating discovery of new first-in-class medicines, but has also led to higher attrition rates of new lead molecules2. One of the most important and widely studied phenotypic responses is apoptosis; particularly in oncology research. Understanding apoptosis as it relates to a particular disease helps in understanding its pathogenesis, as well as how it can be treated.
In cancer, the normal course pursued by a cell towards death via specific stimuli is lost, leading to uncontrolled cell division. This represents a major causative factor in the development and progression of the disease3. A variety of methods exist to track apoptotic activity in whole cells or specific organelles, including antibodies, fluorescent stains, and proluminescent substrates.
In the first 20 years the company produced 15, microscopes. By the end of the first decade of the 20 th century, Leitz had expanded its product line to include film projectors for the nascent movie industry and binoculars. Polarizing Leitz microscopes were introduced in
Every microscope has weak points, even those instruments you can trade for a new sports-car. Generally spoken the worst instruments are those which are designed by the marketing department of the firm, being Wetzlar, Jena or Tokyo based. I have fallen in love with the Zeiss Opton Stativ W. The W is one of the first postwar instruments, and designed from scrap by refugees. The result was an uncompromised instrument, made from the best materials, of highest precision and with some very unknown features.
For instance you would not find a substage on this stand. The condensers fit with a clever designed bayonet in the subtable. On the condensor a level permits lifting the condenser for 0,8 millimeter. This only for correcting for the thickness of the glass of the slide. The bayonet centers the condenser and I was able to get a sharp projected image of the field diaphragm in all specimens.
There are no pictures, minimal lay-out, no links or sorting and searching systems. This is not a web-site, it is a rough article for review by serious and knowledgeable Minolta collectors, from one to another. Not all minor variants have been included, though most are indicated in the details.
5 The Excellent Leitz Microscopes with Black Enamel Finish The Leitz Ortholux, Dialux and Laborlux of the Forties and Fifties In , the Leitz Ortholux microscope was introduced.
Kellner founded what was named the Optical Institute in Wetzlar Germany in By he employed twelve workmen and was producing his first microscopes. While first applied as an eyepiece for telescopes and then later adapted to the microscope, it enables a large flat field of view. Unfortunately, at only the age of twenty nine, Kellner succumbed to tuberculosis in The Optical Institute survived under the leadership of Friedrich Belthle, an apprentice of Kellner’s, who married Kellner’s widow shortly after his death.
In Ernst Leitz joined the Institute. By he was a partner in the firm, and later became the sole proprietor after Belthle’s death in For some biographical information about Carl Kellner, link here. In the pamphlet Leitz Microscopes for Years3, it is mentioned that during this early period of the Optical Institute under Kellner’s and Belthle’s leaderships, at least three different models of microscopes were manufactured.
Facilities include high-temperature furnaces and sample preparation equipment. It began operation in summer , and, after two years of partial department support, a full-time technician position is now fully supported by ZAPLab industry clients and research collaborators. Graduate student training in the facility is continuous and comprehensive, attracting students from across the Western community and the region.
In Ernst Leitz joined the institute and by was a full partner. Upon the death of Behltle, Leitz became the sole owner of the now renamed company, E Leitz, Wetzlar. Leitz continued to manufacture quality microscopes and telescopes.
Photos are all thumbnails, so just click on them for a larger image Note: The ones posted here are for your personal information only, not for sale or commercial use including eBay without permission from the owner. I don’t own most of the document copyrights, but pdf files I have scanned from documents in my library are also my property. If you notice that someone has stolen a photo or pdf file from here for their profit, please let me know. Leitz microscope line in the late s, from The Microscope and its Applications, by Determann and Lepusch.
Many thanks to these contributors of Leitz images and documents: The vertical side arm connects the lower and upper polarizing filters, so they can be moved together instead of rotating the stage. This allows certain types of fragile samples to stay still.
But consider their merits. Microtomes are often fine pieces of mechanism. There are numerous different designs.
COMPOUND MICROSCOPES ON THIS SITE This site shows microscope in my collection, formerly in my collection, and selected instruments from the collections of my friends willing to share their images. The site includes compound microscopes of the 18th, 19th and 20th centuries.
The laboratory specialises in the analysis and identification of rock and soil material, as well as the fluids trapped in rocks. The laboratory manager must be contacted at the project planning stage if use of the laboratory facilities is envisaged. This ensures that correct sample collection procedures are chosen for the specific analytical processes required, and subsequently, the correct methods and procedures are chosen. It also allows the proper scheduling and resourcing of the work requested.
The laboratory is housed in modern facilities, has a team highly skilled and educated staff trained to not only operate the latest analytical equipment but to provide interpretation of data. The quality of the data is assured by using standard operating procedures and quality control measures which enable the accuracy and precision of the data to be demonstrated.
Sample preparation The aim of sample preparation is to produce a sample that is both representative and homogeneous of the sample submitted, and also suitable for the many analytical processes required for analysis in the laboratory. Sample preparation is essential for the liberation of elements of interest, aids in decomposition techniques, and reduces particle size effects in techniques such as X-ray fluorescence XRF.
The end result for geochemical samples is a fine, dry material or powder.