用旧钢砂鑽头改制取粉管接头

过去我队所用的取粉管接头都是用实心圓鋼鑽孔車制的,需要很多鋼材,而且丝扣磨損后即不能继续使用,金属材料浪费很多。后來我們用旧鋼砂鑽头,下面切去水口,車上接岩心管丝扣,中間焊上一圈以废实心取粉管或岩心管接头改制的圆鋼,車上接取粉     

ON THE OCCURRENCE OF LYSTROSAURUS IN SINKIANG~1

The presence of Dicynodontia in Sinkiang was first made manifest by the beautiful skull described in the same number of the Bulletin, (see above 563) as Dicynodon sinkianensis sp. nov. Recently, a second skull also collected by     

书报评论

著者倍克尔是牛津大学里一位讲师。他这本书的目标是叙述全球各地地理探险的历史,这样的著作从来还没有人作过的。     

THE ORDOVIOIAN GRAPTOLITE BEDS OF PING LIANG, E. KANSU

The physiographic features in the Ping Liang (平涼) area are composed of two parts, the mountain on the south and the loess plateau spreading northward to a great extent.     

GEOLOGICAL NOTES ON EASTERN KANSU

My observations on the geology of eastern Kansu are limited to two traverse lines. The first route was a detour from Ping Liang touching Ku Yuan Hsien and Hai Yuan Hsien when Dr. Andersson and I were going up     

ON THE DISCOVERY OF A NEW DICYNODON IN SINKIANG~1

One of the most important results obtained by the Sino-Swedish Expedition led to Sinkiang by Dr. Sven Hedin during the years 1925-1931, has been the discovery, by Professor Yuan, of a rich Permo-Triassic reptilian