ESCALATOR IN GARAGE SPEEDS CAR SERVICE
Workers in a San Francisco, Calif., garage, with a 1,000-car capacity, can deliver a customer’s automobile from the eighth floor to the sidewalk in forty seconds. This is made possible by a vertical escalator and a long ramp down which cars are driven. Each worker, going for a car, steps on a tiny platform attached to an endless belt and rides straight up. To descend, he steps on the other side of the escalator and rides down. Electrical motors keep the escalator running constantly.
Simple Electric Eye Rings Fire Bell, Open Garage Door
ANYONE interested in experimental electricity can gain a great deal of knowledge and pleasure from the construction of this light-sensitive selenium cell, and have also a handy electric eye that will actuate through a relay any bell, motor or magnet circuit in the bargain.
First, in making the cell, notch the long edges of a piece of mica with about twenty teeth, and drill small holes in the corners, as illustrated in Fig. 3. Next tie the end of a length of No. 18 wire to one pair of holes in the mica and wind on approximately 10 turns, using every other notch along both top and bottom edges. Pull tight and tie the opposite end of the wire in the holes at the opposite end from where it was first tied. Do the same with the second piece of wire, tying the ends in the opposite corners. Fig. 3 will show this plainly. Then test out each winding as illustrated in Fig. 4. If the two windings touch at any point the lamp will light.
COME TIME AGO a businessman named A. G. Dezendorf gazed at the Washington Monument while calculations tumbled through his mind. The monument, he knew, was 55-1/2 feet square at the base and 555 feet high. Its lower 400 feet. Dezendorf calculated, contained enough space to park 648 automobiles.
Nickel Meter Stops Overparking
OKLAHOMA CITY is cashing in on its car- parking problem by charging all motorists a nickel to park for from 15 minutes up to an hour, depending on location. At each parking space on the curb is a nickel meter. When a nickel is inserted, a clock mechanism raises a red indicator for the allotted time. The traffic policeman, on making the rounds, passes out tickets where no indicator is showing.