. Directions for laboratory work in physiology. Physiology. GENESIS OF TETANUS. 33 Electrical Couiiectiojis in Primary Circuit of Induction Apparatus. Two kinds of coils are used by the students. Model A in which the secondary coil slides on metal rods, and Model B in which the secondary coil slides on the wooden base. The way in which the binding posts belonging to the pri- mary circuit are connected with the primary coil and the automatic interrupter is different in these two forms of ..^ Fig. 8. Scheme of electrical connections of primary coil in two forms of in- duction apparat
. Directions for laboratory work in physiology. Physiology. GENESIS OF TETANUS. 33 Electrical Couiiectiojis in Primary Circuit of Induction Apparatus. Two kinds of coils are used by the students. Model A in which the secondary coil slides on metal rods, and Model B in which the secondary coil slides on the wooden base. The way in which the binding posts belonging to the pri- mary circuit are connected with the primary coil and the automatic interrupter is different in these two forms of ..^ Fig. 8. Scheme of electrical connections of primary coil in two forms of in- duction apparatus. A, soft iron wires in primary coil; B, hammer; C, contact screw; I, 2, 3, binding posts. Model A—To obtain single making and breaking shocks use posts I and 2. To obtain tetanizing current use posts 1 and 3. Model B—To obtain single making and breaking shocks use posts I and 2. To obtain tetanizing current use posts 2 and 3. In each apparatus if single shocks are needed, the battery and key are connected with the posts to which the two ends of the wire of the primary coil are directlv attached. If a long series of rapidly following shocks are needed, as for tetanus, the battery and key have to be so connected as to bring the automatic interrupter into the cir- cuit. This is done in Model A by connecting the battery with posts I and 3. The current can then enter by post 3. pass to the contact screw, down the spring, then through the wire of the primary coil, and away by post i. In Model B, posts 2 and 3 are used. The current enters by post 3. passes to contact screw, down the spring, through the coil, and awav bv post Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lombard, Warren P. (Warren Plimpton), 1855-1939. Ann Arbor, G. Wahr
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