one foot per see(rod to one foot per minute, whereas annealing operations require several hours or days for their comt)letion. This process will be found to be peculiarly adapted to the production of steel shat'ting, piston rods, and also f()l" very light work, such as burnished steel tbr pivots tbr
โฆ LIBER โฆ
French lighthouses
โ Scribed by C.
- Book ID
- 103085153
- Publisher
- Elsevier Science
- Year
- 1880
- Tongue
- English
- Weight
- 60 KB
- Volume
- 110
- Category
- Article
- ISSN
- 0016-0032
No coin nor oath required. For personal study only.
โฆ Synopsis
417 ltrench
Lighthouses.--All the lighthouses on the French coast, .except three which are provided with the electric light, have been lit since 1873 with lamps burning mineral oil. The luminous intensity ,of the apparatus has been greatly increased, and notwithstanding the increase a saving has been effeeted of more than 400,000 francs ($80,000) per annum, or more than 30 per cent. of the cost of illumination with Colga oil. The use of the mineral oil has not caused a single accident in lighthouses, and after some trials it has also 1)ecn brought into use for floating lights.--L'Ingen. U~tiv.
C.
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