Marking time

Marking time

Thursday 21 May 2015

Controlled vocabulary

I’m the kind of guy who uses a controlled vocabulary to keyword his photos. This means that I use consistent words to describe things. Am I sadly obsessive? Maybe, but there are benefits.

There are about 75,000 images in my Lightroom catalog​—​some scanned, some born digital. I have assigned keywords and other useful metadata to almost all of them. For keywords I use the Getty Re­search Institute’s excellent Art & Architecture The­sau­rus, the Australian Pictorial Thesaurus, and my own controlled lists of terms for projects, places, people, and specialised subjects.

A digital camera image from my catalog. Here’s some of its metadata: Keywords: information > data > metadata; United Kingdom > London; photographer reflection; ar­chi­tec­tur­al elements > walls > exterior walls > facades > storefronts. Location metadata: 51°31’1” N, 0°8’33” W, Regent Street, London. Captured: 2010-09-06 13:07:54

Give me a few seconds and I can find images marked with rusti­cation (99 hits), or thermae (35 hits), or Lucy Marquis-Kyle (1,873 hits). As I add new images and metadata the whole collection gets richer.

Keywords: sculpture (visual work) > reliefs (sculptures) > bas-reliefs (sculpture); light (energy) > daylight [natural light]; architectural elements > friezes (ornamental areas); Italy > Pompeii; health facilities > public baths > thermae [Roman baths]; vaults (structural elements); sites (locations) > World Heritage Sites. Location metadata: 40° 45’ 2.994” N, 14° 29’ 2.43” E, Pompei, Campania, Italy. Captured: 2010-10-12 14:26:34

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Monday 4 May 2015

On not collecting

Museum people are acquisitive, mostly. They thrive on adding things to their collections, and so ensuring the survival and display of those things.

But some things are better left where they are​—​like the remains of the aircraft in this photo. The site is on the Cox Peninsular, west of Darwin, where a B-24 Liberator bomber crashed in Janu­ary 1945, killing the six American crewmen. Components of the plane now lie scattered across the site, among trees that have grown up in the seventy years since the crash.

The bits of the plane, left in the tropical scrub where they fell, evoke this dramatic event. The same bits, if they were taken away to a museum, would not have the same evocative power.

The crash site is marked with a red pin on this map of the area. More information about the site is in an article in the 380th Bomb Group Association newsletter, a web page, and another web page.

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Saturday 25 April 2015

Passing close to the rocky coast

This might be the day for quiet perusal of a diary entry from a long time ago.

Engraving of a seascape

Frederic Schell, Wilsons Promontory, drawing reproduced as a wood engraving in the Picturesque atlas of Australasia (Sydney: Picturesque Atlas Publishing Company, 1886–88).

Permanent URL. Use it to bookmark or link to this item.   filed under History + Lighthouses

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Friday 20 March 2015

Doing wet plate photography

To go with the exhibition The view from here the Mu­seum of Brisbane put on a one-day workshop on the wet-plate (collodion) photographic process last Saturday. The workshop was taught by photographer Craig Tuffin and organised by Hilary Perrett from the museum. It was limited to three participants and I was one of them. The other two were pho­to­graphy students at the Queens­land College of Art where the workshop was held. There we had the use of well-equipped and well-ventilated darkrooms.

Craig explaining the intricacies of the wet plate process.

Craig Tuffin is a fine art photographer who incorporates nine­teenth-century processes in his practice​—​processes that he has mastered through study and experiment. The two other work­shop participants were interested in the creative use of these processes. I don’t aspire to make such work​—​for me the work­shop was a chance to un­der­stand the practicalities that my second great grand uncle Daniel Marquis dealt with.

Pouring collodion onto a glass plate.

Daniel Marquis was a com­mer­cial photographer in Scotland from the early 1850s, came to Brisbane in 1865, and operated a studio here until his death in 1879. The collodion (wet plate) process was the pre­dom­in­ant photographic process throughout his pho­to­graphic career. Skilled operators like Daniel could make excellent photographs with collodion but, as I was to find out, there were many technical difficulties.

Explaining the method of varnishing the finished plate.

The simplest application of the collodion process was the tintype, a photographic image made on a sheet of tinplate coated with black japan (a kind of bituminous lacquer). Each tin­type photo­graph is a unique artefact produced by exposure to light in the camera, rather than one of any number of prints made from a negative.

With Craig’s guidance we each produced several tintype photos, by coating, sensitizing, exposing, developing, and varnishing a metal plate. Instead of japanned tinplate we used sheets of alu­minium with a modern paint finish, but in other respects the materials and meth­ods would have been familiar to Daniel Marquis. Here is an outline of the steps we followed.

Setting up the camera​—​Craig brought along various large-format cameras. I chose to use his 4x5 inch Sinar which brought back memories of working with similar gear.

Coating​—​This step involves holding the plate horizontal and pouring collodion on to it, tipping the plate slightly so that the sticky fluid coats it evenly. Easier said than done.

Sensitizing​—​Under dim red light, the still-damp plate is placed into a bath of silver nitrate for three to four minutes, taken out and dried on its back and edges, then inserted into the lightproof plate holder.

Exposing​—​Quickly, while the emulsion is still damp, the plate holder is placed in the camera (which has already been set up and focussed), the dark slide withdraw, and the camera shutter opened to expose the plate to light. Judging the exposure, given the uncontrolled variables, seems to be a black art.

Developing​—​Quickly, before the collodion emulsion dries, the dark slide is refitted, and the plate holder is taken back to the darkroom for processing. The developer is poured onto the plate (evenly, not too slow, not too fast, not too vigorously…) and gently shaken while the development proceeds under the red light for about fifteen seconds. When it is judged that the time is right (another black art) the development is stopped with water, and the plate is rinsed with several changes of water, then fixed in hypo for five minutes, then put into a hypo-clearing tray, and then washed for thirty minutes and allowed to dry.

Varnishing​—​To protect the fragile emulsion from physical and atmosperic damage it is coated with varnish. First the plate is warmed, then an even coating of gum sandarac varnish is deftly poured on it. It take practice to achieve deftness.

Warming a plate in preparation for varnishing.

At the end of the day I was pleased to have made three tintypes with recognisable images on them. If I were to set up a dark­room and work on my skills I’m sure I could make some decent wet plate photographs, but I don’t intend to do that. It was enough for me to have a day’s exposure to some of the realities of nine­teenth-century pho­tog­raphy. It took me a step beyond what I had got from books.

My first attempt at making a tintype image. One learns this process by trial and error. This plate shows a good collection of errors​—​I can see where the collodion coating skipped some places, where I flowed the developer unevenly or too vigorously, and where the varnish missed a corner. I am pleased to have made this artefact, with all of its flaws. It’s wonderful to feel a connection with the things Daniel Marquis did for a living, a hundred and fifty years ago.

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