The need to gauge the divisions of the day and night led the ancient egyptians , greeks and romans to create sundials , water clocks and other early chronometric tools 古埃及人、希腊人与罗马人为了测定昼夜之别，发明了日晷、水钟及其他早期计时工具，后来由西方世界继承了这些技术。
2.
Precious metals and their alloys and goods in precious metals or coated therewith , not included in other classes ; jewellery , precious stones ; chorological and chronometric instruments 不属别类的贵重金属及其合金，以及不属别类的贵重金属制品或镀有贵重金属的物品珠宝，宝石钟表和计时仪器。
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Class14 ： precious metals and their alloys and goods in precious metals or coated therewith , not included in other classes ; jewellery , precious stones ; horological and chronometric instruments 类别14 ：不属别类的贵重金属及其合金，以及不属别类的贵重金属制品或镀有贵重金属的物品；珠宝，宝石；钟表和计时仪器。
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Class 14 precious metals and their alloys and goods in precious metals or coated therewith , not included inother classes ; jewellery , precious stones ; horological and chronometric instruments 商标注册类别14不属别类的贵重金属及其合金，以及不属别类的贵重金属制品或镀有贵重金属的物品；珠宝，宝石；钟表和计时仪器。
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In the early days , the observatory was tasked with making meteorological and magnetic observations and provided chronometric services based on astronomical observations . the observatory has kept observation records since 1 january 1884 . today , it continues to monitor and forecast the weather 天文台早期的工作包括观测气象、地磁、以及根据天文观测报导时间，并由1884年1月1日开始保存观测记录，天文台至今仍然肩负监测本港天气的重任。
