. Le génie ferroviaire et de locomotive : un journal pratique de la force motrice ferroviaire et du matériel roulant . illustration fine des détails du VValschaerts valvegear, et il est encore beaucoup calledfor. Comme nous le verserons dans nos publicitescolonnes, ces cartes sont en vente et peuvent être achetées auprès de notre agentsor. Les sous-scribers renouvelés ainsi que les nouveaux devraient exprimer leur préférence en ce qui concerne les cartes, et une copie de la carte choisie par elles sera sans délai pour-warded. Pendant ce temps, nous avons promis, comme promis, de répondre à la première section des questions attachées à ChartNo. 10, et la fourrure
2552 x 979 px | 21,6 x 8,3 cm | 8,5 x 3,3 inches | 300dpi
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. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . fine illustrationof the details of the VValschaerts valvegear, and it is still being much calledfor. As will be seen in our advertisingcolumns, these charts are on sale, andmay be purchased through our agentsor from us. Both renewed as well as new sub-scribers should express their preferencein regard to the charts, and a copy ofthe chart chosen by them will be for-warded promptly. Meanwhile we pro-ceed, as promised, to answer the firstsection of questions attached to ChartNo. 10, and will furnish answers to the Educational CfiartN? 10 5. Has this valve inside lap?A. No. 6. What is lap? What does it mean?A. Lap is the distance the valve edge extends over the steam portswhen set on the middle of the valveseat. 7. Why is lap given to a valve? A. Lap is put on the valve to makethe engine work steam expansively, bycutting off steam before the pistonreaches the end of its stroke. 8. Where would you place the valveif you had to disconnect for a brokeneccentric? A. On the middle of the seat.. —^- piBit«jiofPin»*eiiCrass!iea(lismCenlrT FAC-SIMILIE OF OUR EDUCATIONAL CHART No. lo- TlIE PISTON, CROSSHE.U AND VALVE ARE CELLULOID AND ARE MOVABLE. the new chart, there are a series ofthirty-six questions printed upon theback of the chart, and referring chieflyto the problems involved in the motionof the piston, main-rod and slidingvalve. We stated that answers to thesequestions would begin in the Januaryissue, and the first series is hereby ap-pended, and we would particularly callthe attention of the younger railroadmen to an attentive perusal of thesequestions and answers, to the end thata thorough familiarity with the impor-tant lessons which the chart conveysmay be fully mastered by the thought-ful student. It should be readily understood byintending subscribers that while thegreat body of our renewed subscribersat this season of the year are asking forthe new chart, th
