Muybridge Re-enactment

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Some may remember that the RPS Historical Group is organising a re-enactment of the trotting pony exercise, as part of the marking of the centenary of Muybridge's death in Kingston upon Thames.
 
The re-enactment, using 20 or so 10x8 field cameras, with standard lenses with their shutters on 'time', will be at Ham Polo Club. We have designed a guillotine shutter to go in front of the lens. Our mock up, made of sheet zinc, works. What we have to decide is the width of the slot in the guillotine blade.
 
Basic arithmetic suggests that an exposure of 100th of a second would be obtained if the slot were approximately 1/100th of 32 feet or 3.84 inches with a slot of 1.94 inches giving a speed of 200th of a second. These figures are based on the assumption of a body falling at an acceleration of 32 feet per second per second. There is not going to be much acceleration in a fall of two or three inches.
 
This is all a bit of fun, but does anyone have any reason to doubt this arithmetic ? Or, for that matter, suggestions as to the quality of cotton needed to activate the guillotine when it breasted by the trotting horse.
 
The Muybridge Conference will be in November. Also do not forget APIS 2004 in Scotland in September. Further details at www.hands-on-pictures.com
 
Terry
 
 
Terry King FRPS

RPS Historical Group (Chairman)

www.hands-on-pictures.com/

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