Clinics

A SIMPLE ECONOl\IlCAT, l\fI<J'l'HOn OF OH1'HonONTIC

PIIOTOGHAPHY*

By BARNEY KENNEDY, D.D.S., J'ACKSON, MISSISSIPPI

WI '!'H an ordi~ary kodak of suitable size, two portrait attachments, whichmay be obtained at any kodak shop at a cost of about a dollar each,

photographs may be made of a definite size, for comparison, and in everyway fulfill the requirements of the orthodontist.

The kodak may be put in definite focus for all times in the followingmanner: Extend the bellows to full length; take the lenses out of the por­trait attachments, using a narrow paper shim between to prevent the twolenses from coming in contact, and put both in the same attachment bcingsure that the convex sides of both lenses are on the outside, and place on thelens of the kodak. See that the portrait lens is securely attached to the kodaklens and forced all the way home. Next open the stop all the way. Placeindicator on time exposure to keep shutter open, then remove the back coverof your kodak. You are now ready to get your permanent focal distance atwhich all YOUI' photographs are to be made; no subsequent focusing will benecessary.

With a white piece of tissue paper placed on the back of the kodak in theposition your film occupies and the lens shutter open, hold the kodak in thehands and focus on the filament of a stationary light bulb, moving the kodakback and forth to get the best image of the filament on the tissue paper.Now hold the kodak in this position and have your. secretary measure thedistance from the lens to the point of thc light filament'. 'I'his measurementmay be made with a tape or yard stick and cut off and used in placing yourpatient this distance from the kodak; this distance will probably be betweenfifteen and twenty-four inches.

The time of exposure will have to be worked out, depending on yourform of light. .If natural light is to be used, the bulb exposure is recom­mended. Little difficulty will be experienced in working out this part of thetechnic.

This method of making your own photographs is simple, inexpensive, def­inite, and a time-saver for the busy orthodontist.

'Clinic presented before the Twenty-sixth Annual Meeting of The American Societyof Orthodontists, Ohicug», May 2-5, 1921.

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