Cyclopædia of obstetrics and gynecology . ps, the head at the superior strait. The dotted lines show the posi-tion of the instrument at the end of labor. My colleague, Bailly, has brought forward the following objectionsagainst the use of mechanical tractors in labor: 1. These tractors substitute blind force for that of the sentient guidinghand. 2. They act in only one direction, and do not allow us to change thetraction line according to the change in the pelvic axis; consequently ob-lique force is applied to the pelvic walls, which, from mechanical princi-ples, results in loss of direct forc
Cyclopædia of obstetrics and gynecology . ps, the head at the superior strait. The dotted lines show the posi-tion of the instrument at the end of labor. My colleague, Bailly, has brought forward the following objectionsagainst the use of mechanical tractors in labor: 1. These tractors substitute blind force for that of the sentient guidinghand. 2. They act in only one direction, and do not allow us to change thetraction line according to the change in the pelvic axis; consequently ob-lique force is applied to the pelvic walls, which, from mechanical princi-ples, results in loss of direct force. 3. Mechanical tractors interfere with lateral movements of the forceps. 4. They may slip from the head before the accoucheur knows it; and,if a force of 17 to 18 pounds is being exerted, what may not happen tothe maternal parts ? 5. If manual traction be sufficient to bring down the head through acontracted pelvis, Avhenever this is at all possible, what scope or necessityis there for mechanical tractions? 68 A TREATISE ON THE FORCEPS. 69 6. The time requisite for tlie introduction of these instruments mustadd to the maternal suffering. 7. Facts have proved that not only are mechanical tractions dangerousfor the mother, but that further the very foetal lesions which they aim toprevent are more frequent than after the use of the ordinary forceps. Although the modifications of Pros and of Poullet have negatived cer-tain of the above objections, the others are still valid, and we are in per-
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