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MANAGERS AND PROJECTIONISTS 805
There are, however, two important points of difference between the Ashcraft and the straight high intensity lamps, viz : (A) The Ashcraft lamp rotates its positive electrode by means of a motor which performs this function, and at the same time feeds the carbons forward as they burn away, but the carbon only revolves approximately two times per minute, whereas the usual high intensity lamps all use a much higher speed of rotation. (B) The regular high intensity lamps all use high intensity carbons exclusively, whereas the Ashcraft lamp may use, in cases where the current does not exceed 95 amperes, what is known as the "white flame" carbon. This carbon has a diameter of one-half inch. Its composition is of such a nature that it operates as a high intensity carbon, viz : It is sufficiently soft that a deep, symmetrical crater is formed, in which the brilliant high intensity gaseous ball of flame is contained. The crater area is slightly greater than that of the corresponding high intensity carbon, thus presenting a larger surface area to the collector lens. The 11 m/m carbon may also be used for the 80 ampere type, but in excess of 95 amperes the manufacturer recommends the regular 13.6 m/m only. The lamp illustrated shows the 120 ampere type, with the heavy cast alloy positive baffle plates.
Until recently these lamps have only been in use in the West, hence we have not had an opportunity to personally examine their performance. We therefore set forth only the manufacturer's claims. However, there can be no doubt but that the lamp gives excellent results, because it has climbed rapidly into popularity in the West in territories where high grade projection is the rule. Reports of the lamp from West Coast projectionists are excellent. It is for these reasons it has been admitted to the Bluebook, where only equipment which we have good reason to believe, or which we personally know to be high grade, is admitted.
The manufacturer does not recommend the use of the high intensity carbon in theatres where the current used does not exceed 95 amperes, as the claim is made that a softer, and at the same time very brilliant screen illumination results from the use of the white flame carbon without the objectionable harshness of the high intensity light; also that the screen brilliancy is very satisfactory even in cases where demands for extremely high screen illumination are made by the projectionist or exhibitor.
One peculiarity of the Ashcraft lamp is that instead of the carbon rotating element erioDiner the carbon well back from