SOME NEW APPARATUS. BY E. W. Scripture. The constant activity of the laboratory workshop during the two years since its first productions were described1 has resulted in over fifty new pieces of apparatus for the purposes of research and demonĀ¬ stration. Of these I have selected for description only a few whose fundamental ideas may be serviceable to the investigator. Pendulum chronoscope. The spark method previously described2 has reduced the labor of making records of reaction-time to a point lower than obtainable by any other method recording accurately in thousandths of a second. The apparatus, however, is not portable. We set ourselves, thereĀ¬ fore, to produce an apparatus fulfilling the following requirements : 1, accuracy to the thousandth of a second ; 2, ease in transport ; 3, readiness of setting up ; 4, quickness in reading ; 5, availability for many kinds of experiments on time. These requirements were met after eight months of labor by the first pendulum-chronoscope. Two chronoscopes were built later, but the model remained essentially the same. The pendulum-chronoscope contains in the first place an accurately adjusted double-bob pendulum. This pendulum is held by a catch at the right hand side. In making an experiment this catch is pressed noiselessly and the pendulum starts its swing. It soon reaches a light pointer held in position by a delicate spring and carries it along. At exactly the moment it takes up the pointer it presses a delicate catch which releases the mechanism beneath the base. This mechanism is adjusted to do several things ; one of them is to drop a shutter which covers an opening in a metal plate at the back of the chronoscope. The person experimented upon is seated at the back ; owing to the curtain, he can see nothing but the metal plate 1 Scripture, Some new apparatus, Stud. Yale Psych. Lab., 1892-93 I 97. ^ 5 Bliss, Investigations in reaction-time and attention, Stud. Yale Psych. Lab., 1892 I 7.