Photographer's Slide Rule

Saturday, September 17, 2016 0 comments

Before there were lightmeters...

Another interesting Nomographic device.

Like the Airship Engineer's Slide rule I discussed previously, other technically complex disciplines made use of nomographic devices to simplify on the fly calculations.

Photographers developed devices for determining exposure times known as Actinographs.

The name originally meant a device that recorded the amount of sunlight for a day but was adopted for the photographer's slide rule that used that data.

Here is an example from the later 19th C

Since the exposure time depended on several factors these could be set by sliding the scales. The scales were adjusted to account for plate speed, lens type, and other variables.  The curves on the roller indicated the changing light intensity for different times of the year.  The result was an estimate of the exposure time needed.

Here is another Actinograph that used a card instead of a roller for the sunlight data.
This is one of the first commercially produced devices made by Ferdinand Hurter and Vero Charles Driffield and patented in 1888.



Keep your sightglass full, your firebox trimmed and your water iced.
KJ

World Championships!

Sunday, September 11, 2016 0 comments


A Beautiful days duelling.

Yesterday Saturday Sept 10, 2016
A short Thank You video I made with the photos I had handy this morning.




Once the semi-official photographers have their photos available I will prepare my formal(esque) report.

Here are the new World Champions!

2016 World Champions
Standing L to R
Monica Willard (Creator of Street Dueling), Cali Brewer Duelling Champion, Karen Siemens 2016 World Champion,
Cindy Bedford Street Duelling Champion
Seated L to R
Raven Hawthorne Flirtation Trials Champion, Josanna Justine Compulsory Figures Champion
Missing Briona Justine World Junior Champion


 Congratulations Ladies!

In the meantime check out Jayne Barnard's Clockworks and Crime.
And Madame Saffron Hemlock's Parasol Duelling League on Facebook of course!

Keep your sightglass full, your firebox trimmed and your water iced.
KJ

2016 World Championships Sept 10th!

Thursday, September 1, 2016 0 comments

Only a week to go!

Get your Parasols tuned up ladies, and come out to compete to be the 2016 World Parasol Duelling Champion!


Keep your sightglass full, your firebaox trimmed, and your water iced!
KJ

About Gears, Goggles, and Steam oh My!

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