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SEE-ESS WINDER
The winding of numerous inductances for experimental work is made easy with the above apparatus. The result is a self-supporting diamond weave coil of any desired inductance. A desirable addition to the constructor's laboratory. Distributed by the Wireless Electric Co., 204-206 Stanwix St., Pittsburgh, Pennsylvania. Price, $10.00
KELLOGG REPRODUCER
The unit of this speaker is of special construction, having a magnetically modulated diaphragm. Coupled with this is the horn which was developed to be as nearly correct acoustically, both as to shape and material, as possible. This reproducer covers practically the entire auditory range of sound waves very successfully. Made by the Kellogg Switchboard & Supply Co., Adams & Aberdeen Sts., Chicago, Illinois. Price, $20.00
BELDEN LOOP WIRE
A wire composed of 60 strands of bare copper twisted with 5 strands of half hard phosphor bronze wire. This twist is then covered with cotton and finally with a good looking brown covering to match the better grades of loop frames. Made by the well known makers of wire, the Belden Manufacturing Company, Chicago, Illinois
BALLGRIP
BINDING
POST
These interesting binding posts represent a new idea in this field. Connections may be made instantly and the opening in the post is large enough for receiver cord tips. Springs force the ball to make good electrical contact when a wire is placed in position. The fact that there is no head to loosen and be lost is a decided point in its favor. Made by the Quality Moulded Products Inc., Jersey City, New Jersey
VELVET VERNIER DIAL
An all-vernier dial with a ratio of approximately four to one and is entirely free from back-lash. With this dial you not only enhance the appearance of your receiver but also make tuning very easy. Made by the National Company, Inc., 110 Brookline St., Cambridge, Massachusetts