第228章
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是他确定要留任汉中，写来报喜兼道谢的信。随信还了附了一车鲜桃、杏、西瓜之类的土仪，一箱不知是福建还是广西捎来的玻璃罐装的糖水荔枝、白桃、杨梅之类，还有几小篓用彩印纸盒包得漂漂亮亮的炒米糖、窝丝糖、牛奶糖。
杨侍郎一个壮年男子孤身在军中，哪里要吃什么糖？看着这些东西，便猜测是周王府里给小皇孙备的，桓凌这个做舅舅的顺手捎给宋时，宋时就做主给他送了些来还礼。
这样的东西他虽然不吃，却也不好散给别人，便叫人包好了捎往家中。
鲜果他尝了一点，倒都味道不错：西瓜是脆沙瓤的，清甜解暑；杏子甘酸可口，吃着满口生津；鲜桃是洋县产的佳品，尤其甜美多汁。
不过他也未肯多吃，尝了几个便叫人拿下去散到军中。
榆林地方气候干旱，军中更为艰苦，除了沙地上能种些西瓜，鲜果鲜菜都吃不上多少。他自己往汉中府去就能再尝到，这些且拿去慰劳将士守边之功吧。
杨巡抚吩咐人将瓜果端下去，替他人整理行装，收拾好衙内文书。他要亲去汉中一趟，看看宋时他们炼油塔的进度，哪怕大的做不出，至少要再弄几个小的来。
榆林到汉中相距一千余里，不过杨大人年纪虽大几岁，也还称得上“武姿英迈”，能骑马长途奔驰，十余天后便到了汉中。
他来得突然，事先并无通报，直到一行人下了船才向周王府和汉中府衙递了帖子。
周王此时却因为圣上特旨赋予他更大权柄，不敢辜负圣恩，带着桓凌再度出巡，只有宋时带着满府官员匆匆出城相迎。因为周王不在府，杨巡抚也不必在外头沐浴更衣后再行拜见，但直接进了汉中府，考察宋知府近日政绩……
先察炼油塔做成了没有。
宋时是久经考验，官场里锻炼出来的人，便是不做自己的事，也要把领导交代的任务办好，当下便笑着说：“大人来得正是时候，桓大人临行前就怕耽搁了这事，带着多少学生日夜计算，总算弄出了图纸。只是汉中地界上不产石油，纵然建起塔也运转不起来，大人那里已有了学生和工匠，便将图带回去试建吧。”
为了安全起见，这座大塔也就一丈许高，和他们烧炼石灰的灰窑差不多。燃烧室和塔身都做了钢筋加固，内侧耐火层也加厚许多，用掺了白云石的耐火水泥砌筑成，用厚钢管打制冷却水管、引流管……
宋知府虽然不爱计算这些料材，却也为杨大人交办的事尽心竭力，想法做出了金属盒气压计，以便随时监控炉内气压，保障安全。
他这些年讲学时讲过大气压强原理，杨巡抚不曾亲耳听过，却看过他讲气压、气象的文章，深深为其中所写的大气周流之理打动。而今听他说起气压计，不由得又勾起旧日好奇之心，眼中霎时冒出涟涟光采：
“本官从前见过人学宋知府做水银气压计，这金盒气压计又是何等形制，莫非是改以金盒盛水银而成？”
可金盒装了水银，那盒子就被融成金汞齐了，又怎么量得了气压？
宋时微笑着答道：“这个倒不用水银，只用一个空心的小铜盒，将里头的气放净，外头气压压扁了盒子，此时记下的气压就是天之气的气压。其上可用钢片连以指针，再拿着水银气压计和它一起从山底量到山顶，量其变化之微刻下数字，依这些变数算出指针转动到何处，该得气压比平地气压高低多少。”
他手头就有做好的、正在试制的气压计。虽然技术有限，金属盒里达不到绝对真空，但有水银气压计做对比，压力差记得准，这气压计还是可以信赖的。
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