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Technical Developments.
483
Streemlite outfit. The Simplex is of course handicapped in the British market by its American oiigin, but in the Westar we have an example of a projector of American design — originally the Century — being manufactured in this country.
On the Continent, the firm of Philips maintain their pre-eminence, their newest machine, known as the F.P.7, being widely used (12). The same firm has produced a particularly attractive 35mm. portable projector, which combines many novel features with an exceedingly high optical efficiency (13).
A still projector which lives up to its title is the All-Purpose Lantern, marketed by Robert Rigby. It is designed to project slides and effects and, in addition, to project a sharp spot either on the stage or in the auditorium — the latter for instance to encourage ice-cream sales. One of these lanterns meets all the ancillary projection needs of the kinema (14).
Two arc lamps have been introduced during the year by G.B.-Kalee. The President, which forms part of the G.K.20 outfit, has the novel
feature that two motors are used, one feeding each carbon ('). The Universal, embodied in the 18 outfit, can as its name implies be immediately converted for operation as H.I. or L.I., on D.C. or A.C.(8).
The problem of the optical relation between the arc mirror and the lens aperture has been the subject of a number of articles in the American Press, and in the Ideal Kinema and British Kinematography . With one exception, the authors are in agreement that the popular view is erroneous, that an equal / value of lens and mirror means matched optics and maximum efficiency (13).
Other types of light sources than the carbon arc have received close attention. The mercury-cadmium discharge lamp is widely used in the studio, and A. G. Penny, of G.E.C., has discussed the possibility of its being adapted to 35mm. projection — he suggested, for instance, that it might be flashed during the opening periods of the shutter, so halving current consumption. He concluded, however, that in the present state of knowledge, the carbon arc remains
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