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MARCH 2, 1883.] THE PHOTOGRAPHIC NEWS. 141 This knitting needle must be perfectly straight, and work very A wooden pillar F, the top being cut obliquely, is placed as shown ; on it is fastened a thick brass plate, by a binding screw, B, passing through the slot at one extremity, the other ex- smoothly in E and G. On it, between E and G, a boxwood wheel, I, four inches in circumference, is fixed, and above G a small mirror K. A motion four times as slow as that of the hour-hand of the clock is imparted to the needle, and thus to the mirror, by a silk cord passing round the boxwood wheels, M and I. An elastic band and a small hook is the best means of keeping the cord tight; it should always be detached when the instru ment is not in use. Another and larger mirror, L, mounted to allow of its rotation in all directions, and elevation to any required height, is placed in front of the mirror K, and generally on it left-hand side. A stout card, R, whose sides are the same length as the needle, is divided into degrees, minutes, and seconds. A small plumb-line, P, a spirit-level, and a compass, complete the apparatus. The general arrangement for working with a Swan lamp is shown by the subjoined figure ; but for the detailed de. gummed, to the back of a square of thick plate glass, D, the whole being fastened to A, as in the figure. A ball-and-socket joint is fixed at E, the ball having a hole puuue uug. •I -— — — J, — — half-way through it, the orifice being on a level with the top of tremity being perforated to receive a knitting needle, H. the glass plate, and in a direct line with NS. r " * f-mtl-mtckt —3 — scription of the apparatus we must refer our readers to the book itself. BICYCLES AND TRICYCLES AS A MEANS OF LOCOMOTION TO PHOTOGRAPHERS. BY C. E. ARTHUR. Having noticed from time to time in the Photographic ' News queries respecting the practicability of the adoption of bicycles and tricycles as a means of locomotion to photo- j graphers, I beg to offer a few practical remarks of my view of the case. Sici/cks.—Hitherto I have noticed that all the advice given in the Photographic News under this heading has only been for the carrying of such apparatus as the sceno- graph, or, at the best, the conveying of a very limited number of plates. But by my plan, apparatus sufficient for the use of any professional photographer for half-plate work may easily be conveyed. 1 would suggest that the “ Cassie Luggage Carrier ” be adopted. Bv this means sufficient apparatus can easily be carried without any very perceptible difference in weight to the rider. The arrange ments are very simple, and consist of two metal boxes fixed to the fork of the machine to hang down below the treadle—one box on each side of the wheel. The boxes may measure from ten to twelve inches broad and deep, and about four inches in thickness. The size of the box can, of course, be altered to suit the convenience of the apparatus, but with such cameras as the “ Perfect Pocket Camera,” manufactured by the Sciopticon Company, the