| 摘要 |
<p>A microtome feed-motor control comprises voltage means to generate a first voltage signal and a second voltage signal, said second voltage signal being a multiple of said first voltage signal, timing means for generating first and second pulses of each of said first and second voltage signals, said first pulse being of less duration than said second pulse, first switch means for selecting one of said first and second voltages, and second switch means for connecting said voltage means to said timing means, whereby a feed motor may be driven at a first or second speed and for a chosen duration.</p> |
