Dec 17 2014

Pimp your microscope – automatic objective lens detection

Bastian Asmus

EPIPOL16QR..for any  microscope you might happen to work with. During your microscopy sessions, did you ever wish for less of the dull work, such as noting meta data, contrast method, sample id, photo no or image width? Well – I did.

I did wish for a long time to have a way that my microscope and my camera would speak to each other whenever I change objectives. I am working with Zeiss Universal microscope, mostly with reflected polarising light, i.e. there is no objective revolver. I have to change the objectives individually, which of course, all has to do with the ability to centre the objective for certain steps in polarising microscopy.

To make a long story short: the old days where I have to sit there with a notepad and have to write down all these dull informations are over! From now on my camera, or rather my computer registers any change of my microscope objective and adds this information to my micrographs automatically.

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Oct 29 2014

Meta data and Archaeology: of Photos, finds and QR Codes

Bastian Asmus


Wouldn’t it be great if you could add  meta data to your image  files while doing the actual photographing instead of having to do this afterwards in post processing? In this two part article I present how using QR codes and tethered shooting, can achieve this goal when documenting objects. It saves a lot of time, for example, during archaeological find processing and documentation. The first part deals with the manual creation of QR codes, the second part with a script-based solution, that automates the process of adding meta data to image files. Continue reading

Aug 21 2014

Casting a medieval aquamanile

Bastian Asmus

Foundry: Medieval bronze casting of an aquamanile in a lost wax loam mould – by Dr. Bastian Asmus

The casting of an aquamanile in original medieval technique has been a long term intention of mine. A year ago I made an aquamanile in the form of a lion that dated to the medieval period, however I did not have time to cast that particular aquamanile in a technique that can be considered medieval.- The model however was made with the techniques known to medieval artificers.  It was made according to Theophilus Presbyter’s description in his schedula diversarum artium , a 12th century manuscript on artisan’s techniques. Theophilus’ chapter 61 on the making of the cast incense burners provides all the necessary information, with which an informed reader can go ahead an produce a formidable bronze (or any other copper alloy) casting. This information was used to prepare the mould for the casting of this aquamanile. There will be an article shortly on how to make the mould.

Reconstruction of a medieval loam mould for an aquamanaile in the form of a lion.

Loam mould of the lion aquamanile. The loam mould consists of the same ingredients as medieval moulds.

Casting a medieval aquamanile

The mould was prepared from  loam and made three days before the casting. The wax model was molten from the loam mould over embers. The mould was subsequently fired with charcoal. The charcoal was allowed to burn down to the top of the mould and before it was charged again with fresh charcoal. This was repeated three time s, just as Theophilus tells us . The casting was accomplished through the feet; so the mould is placed upside down for the casting. It was cast with a quaternary alloy of copper, zinc, tin and lead. The alloy is CuZn13Sn8Pb2 and was prepared for the casting.